991
Number 991 (nine hundred ninety-one) is an odd three-digits prime number and natural number following 990 and preceding 992.
| Nominal | 991 |
| Cardinal | nine hundred ninety-one |
Cardinal nine hundred ninety-one |
| Ordinal | 991st |
| Number of digits | 3 |
| Sum of digits | 19 |
| Product of digits | 81 |
| Number parity | Odd |
Calculation was done in 0.0000360012 seconds
| Prime factorization | 991 |
| Prime factors | 991 |
| Number of distinct prime factors ω(n) | 1 |
| Total number of prime factors Ω(n) | 1 |
| Sum of prime factors | 991 |
| Product of prime factors | 991 |
Calculation was done in 0.0000519753 seconds
| List of proper divisors | 1 |
| List of all dividers | 1, 991 |
| Number of divisors d(n) | 2 |
| Sum of all divisors σ(n) | 992 |
| Aliquot sum | 1 |
| 991 is a deficient number , since it is larger than the sum of its proper divisors (1). Its deficiency is 990. |
Calculation was done in 0.0000121593 seconds
| Is 991 a prime number? | Yes |
| Is 991 a semiprime number? | No |
| Is 991 a Chen prime number? | Yes |
| Is 991 a Mersenne prime number? | No |
Calculation was done in 0.0003578663 seconds
| Is 991 a Catalan number? | No |
| Is 991 a Fibonacci number? | No |
| Is 991 a Idoneal number? | No |
Calculation was done in 0.0000038147 seconds
| 991 is not a Happy number |
| 991 is not a Humble number |
| 991 is not a Münchhausen number |
| 991 is not a Perfect number |
| 991 is not a Perfect square |
| 991 is not a Palindrome |
Calculation was done in 0.0066750050 seconds
| Base | System | Value |
|---|
| 2 | Binary | 11110111112 |
| 3 | Ternary | 11002013 |
| 4 | Quaternary | 331334 |
| 5 | Quinary | 124315 |
| 6 | Senary | 43316 |
| 7 | Septenary | 26147 |
| 8 | Octal | 17378 |
| 9 | Nonary | 13219 |
| 10 | Decimal | 991 |
| 12 | Duodecimal | 6a712 |
| 16 | Hexadecimal | 3df16 |
| 20 | Vigesimal | 29b20 |
| 36 | Base36 | rj36 |
| 60 | Sexagesimal | GV60 |
Calculation was done in 0.0000178814 seconds
| Square of 991 (n2) | 982081 |
| Cube of 991 (n3) | 973242271 |
| Square root of 991 | 31.480152477394 |
| Natural Logarithm (ln) of 991 | 6.89871453433 |
| Decimal Logarithm (log) of 991 | 2.9960736544853 |
Calculation was done in 0.0000050068 seconds
| Sine of 991 | -0.98516178536459 |
| Cosecant of 991 | -1.0150617034236 |
| Cosine of 991 | -0.17162825133776 |
| Secant of 991 | -5.8265465749692 |
| Tangent of 991 | 5.7400910263066 |
| Cotangent of 991 | 0.17421326515852 |
Calculation was done in 0.0000150204 seconds
Is 991 an Odd Number?
Yes, the number 991 is an odd number.
Total number of all odd numbers from 1 to 991 is
496Sum of all the odd numbers from 1 to 991 are
246016The sum of all odd numbers is a perfect square: 246016 = 496
An odd number is any integer (a whole number) that cannot be divided by 2 evenly. Odd numbers are the opposite of even numbers.Previous odd number is
989
Calculation was done in 0.0000061989 seconds
| The spelling of 991 in words is "nine hundred ninety-one", meaning that: |
| 991 is an aban number (a number without the letter a) |
| 991 is not an eban number (as it contains the letter e) |
| 991 is not an iban number (as it contains the letter i) |
| 991 is not an oban number (as it contains the letter o) |
| 991 is not a tban number (as it contains the letter t) |
| 991 is not an uban number (as it contains the letter u) |
Calculation was done in 0.0000028610 seconds
| Bengali numerals | ৯৯১ |
| Eastern Arabic numerals | ٩٩١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓍪𓎎𓏺 |
| Khmer numerals | ៩៩១ |
| Japanese numerals | 九百九十一 |
| Roman numerals | CMXCI |
| Thai numerals | ๙๙๑ |
Calculation was done in 0.0000841618 seconds
| Arabic | تسعة مائة و واحد و تسعون |
| Croatian | devetsto devedeset i jedan |
| Czech | devět set devadesát jeden |
| Danish | ni hundrede en og halvfems |
| Dutch | negenhonderdéénennegentig |
| Estonian | alafa asieke blaasieke vɔ ɖekɛ |
| Faroese | níggjuhundraðognítiein |
| Filipino | siyám na daán at siyám na pû’t isá |
| Finnish | yhdeksänsataayhdeksänkymmentäyksi |
| French | neuf cent quatre-vingt-onze |
| Greek | εννιακόσια εννενήντα ένα |
| German | neunhunderteinundneunzig |
| Hebrew | תשע מאות תשעים ואחת |
| Hindi | नौ सौ इक्यानबे |
| Hungarian | kilencszázkilencvenegy |
| Icelandic | níuhundrað og níutíu og einn |
| Indonesian | sembilan ratus sembilan puluh satu |
| Italian | novecentonovantuno |
| Japanese | 九百九十一 |
| Korean | 구백구십일 |
| Latvian | deviņsimt deviņdesmit viens |
| Lithuanian | devyni šimtai devyniasdešimt vienas |
| Norwegian | ni hundre og nittién |
| Persian | نهصد و نود و یک |
| Polish | dziewięćset dziewięćdziesiąt jeden |
| Portuguese | novecentos e noventa e um |
| Romanian | nouă sute nouăzeci şi unu |
| Russian | девятьсот девяносто один |
| Serbian | деветсто деведесет и један |
| Slovak | deväťsto deväťdesiatjeden |
| Slovene | devetsto devetdeset ena |
| Spanish | novecientos noventa y uno |
| Swahili | mia tisa na tisini na moja |
| Swedish | niohundranittioen |
| Thai | เก้าร้อยเก้าสิบเอ็ด |
| Turkish | dokuz yüz doksan bir |
| Ukrainian | девʼятсот девʼяносто один |
| Vietnamese | chín trăm chín mươi mốt |
Calculation was done in 0.0139799118 seconds
| Number 991 reversed | 199 |
| Unicode Character | U+03DF | ϟ |
| Hexadecimal color (shorthand) | #999911 | |
| Unix Timestamp | Thu, 01 Jan 1970 00:16:31 +0000 |
Calculation was done in 0.0000250340 seconds
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