By choosing I Accept, you consent to our use of cookies and other tracking technologies.

# 91

Number 91 (ninety-one) is an odd two-digits composite number and natural number following 90 and preceding 92.

## Properties of the number 91

 Nominal 91 Cardinal ninety-one Ordinal 91st Number of digits 2 Sum of digits 10 Product of digits 9 Number parity Odd
Calculation was done in 0.0000319481 seconds

## Prime Factorization of 91

 Prime factorization 7 x 13 Prime factors 7, 13 Number of distinct prime factors ω(n) 2 Total number of prime factors Ω(n) 2 Sum of prime factors 20 Product of prime factors 91
Calculation was done in 0.0000078678 seconds

## Divisors of 91

 List of proper divisors 1, 7, 13 List of all dividers 1, 7, 13, 91 Number of divisors d(n) 4 Sum of all divisors σ(n) 112 Aliquot sum 21 91 is a deficient number , since it is larger than the sum of its proper divisors (21). Its deficiency is 70.
Calculation was done in 0.0000200272 seconds

## Prime numbers

 Is 91 a prime number? No Is 91 a semiprime number? Yes Is 91 a Chen prime number? No Is 91 a Mersenne prime number? No
Calculation was done in 0.0000150204 seconds

## Sequences

 Is 91 a Catalan number? No Is 91 a Fibonacci number? No Is 91 a Idoneal number? No
Calculation was done in 0.0000040531 seconds

## Number theory

Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions.
 91 is a Happy number 91 is not a Humble number 91 is not a Münchhausen number 91 is not a Perfect number 91 is not a Perfect square 91 is not a Palindrome
Calculation was done in 0.0019299984 seconds

## Numeric Bases of 91

In mathematics, a base or radix of a numeral system is the number of unique digits, including zero, used to represent numbers in that system.
BaseSystemValue
2Binary10110112
3Ternary101013
4Quaternary11234
5Quinary3315
6Senary2316
7Septenary1607
8Octal1338
9Nonary1119
10Decimal91
12Duodecimal7712
20Vigesimal4b20
36Base362j36
60Sexagesimal1V60
Calculation was done in 0.0000171661 seconds

## Mathematical operations

Mathematical operations are actions that are performed on numbers or mathematical expressions to find a numerical result.
 Square of 91 (n2) 8281 Cube of 91 (n3) 753571 Square root of 91 9.53939 Natural Logarithm (ln) of 91 4.51086 Decimal Logarithm (log) of 91 1.95904
Calculation was done in 0.0000050068 seconds

## Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
 Sine of 91 0.105988 Cosecant of 91 9.43507 Cosine of 91 -0.994367 Secant of 91 -1.00566 Tangent of 91 -0.106588 Cotangent of 91 -9.38193
Calculation was done in 0.0000100136 seconds

## Number parity

Parity is the property of an integer of whether it is even or odd.

No

### Is 91 an Odd Number?

Yes, the number 91 is an odd number.
Total number of all odd numbers from 1 to 91 is 46
Sum of all the odd numbers from 1 to 91 are 2116
The sum of all odd numbers is a perfect square: 2116 = 46
An odd number is any integer (a whole number) that cannot be divided by 2 evenly. Odd numbers are the opposite of even numbers.
Calculation was done in 0.0000069141 seconds

## Ban number

In recreational mathematics, a ban number is a number that does not contain a particular letter when spelled out in English; in other words, the letter is "banned".
 The spelling of 91 in words is "ninety-one", meaning that: 91 is an aban number (a number without the letter a) 91 is not an eban number (as it contains the letter e) 91 is not an iban number (as it contains the letter i) 91 is not an oban number (as it contains the letter o) 91 is not a tban number (as it contains the letter t) 91 is an uban number (a number without the letter u)
Calculation was done in 0.0000030994 seconds

## Numeral systems

How to write 91 in other number systems?
 Bengali numerals ৯১ Eastern Arabic numerals ٩١ Hieroglyphs numeralsused in Ancient Egypt 𓎎𓏺 Khmer numerals ៩១ Japanese numerals 九十一 Roman numerals XCI Thai numerals ๙๑
Calculation was done in 0.0000748634 seconds

## Translation

How do you say 91 in 38 different languages?
 Arabic واحد و تسعون Croatian devedeset i jedan Czech devadesát jeden Danish en og halvfems Dutch éénennegentig Estonian blaasieke vɔ ɖekɛ Faroese níti­ein Filipino siyám na pû’t isá Finnish yhdeksän­kymmentä­yksi French quatre-vingt-onze Greek εννενήντα ένα German ein­und­neunzig Hebrew תשעים ואחת Hindi इक्यानबे Hungarian kilencven­egy Icelandic níutíu og einn Indonesian sembilan puluh satu Italian novantuno Japanese 九十一 Korean 구십일 Latvian deviņdesmit viens Lithuanian devyniasdešimt vienas Norwegian nitti­én Persian نود و یک Polish dziewięćdziesiąt jeden Portuguese noventa e um Romanian nouăzeci şi unu Russian девяносто один Serbian деведесет и један Slovak deväťdesiat­jeden Slovene devetdeset ena Spanish noventa y uno Swahili tisini na moja Swedish nittioen Thai เก้า​สิบ​เอ็ด Turkish doksan bir Ukrainian девʼяносто один Vietnamese chín mươi mốt
Calculation was done in 0.0140709877 seconds

## Miscellaneous

 Number 91 reversed 19 ASCII Code 91 [ Unicode Character U+005B [ Unix Timestamp Thu, 01 Jan 1970 00:01:31 +0000
Calculation was done in 0.0000319481 seconds