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# 61

Number 61 (sixty-one) is an odd two-digits prime number and natural number following 60 and preceding 62.

## Properties of the number 61

 Nominal 61 Cardinal sixty-one Ordinal 61st Number of digits 2 Sum of digits 7 Product of digits 6 Number parity Odd
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## Prime Factorization of 61

 Prime factorization 61 Prime factors 61 Number of distinct prime factors ω(n) 1 Total number of prime factors Ω(n) 1 Sum of prime factors 61 Product of prime factors 61
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## Divisors of 61

 List of proper divisors 1 List of all dividers 1, 61 Number of divisors d(n) 2 Sum of all divisors σ(n) 62 Aliquot sum 1 61 is a deficient number , since it is larger than the sum of its proper divisors (1). Its deficiency is 60.
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## Prime numbers

 Is 61 a prime number? Yes Is 61 a semiprime number? No Is 61 a Chen prime number? No Is 61 a Mersenne prime number? Yes: M8
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## Sequences

 Is 61 a Catalan number? No Is 61 a Fibonacci number? No Is 61 a Idoneal number? No
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## Number theory

Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions.
 61 is not a Happy number 61 is not a Humble number 61 is not a Münchhausen number 61 is not a Perfect number 61 is not a Perfect square 61 is not a Palindrome
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## Numeric Bases of 61

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
2Binary1111012
3Ternary20213
4Quaternary3314
5Quinary2215
6Senary1416
7Septenary1157
8Octal758
9Nonary679
10Decimal61
12Duodecimal5112
16Hexadecimal3d16
20Vigesimal3120
36Base361p36
60Sexagesimal1160
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## Mathematical operations

Mathematical operations are actions that are performed on numbers or mathematical expressions to find a numerical result.
 Square of 61 (n2) 3721 Cube of 61 (n3) 226981 Square root of 61 7.81025 Natural Logarithm (ln) of 61 4.11087 Decimal Logarithm (log) of 61 1.78533
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## Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
 Sine of 61 -0.966118 Cosecant of 61 -1.03507 Cosine of 61 -0.258102 Secant of 61 -3.87444 Tangent of 61 3.74317 Cotangent of 61 0.267153
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## Number parity

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

No

### Is 61 an Odd Number?

Yes, the number 61 is an odd number.
Total number of all odd numbers from 1 to 61 is 31
Sum of all the odd numbers from 1 to 61 are 961
The sum of all odd numbers is a perfect square: 961 = 31
An odd number is any integer (a whole number) that cannot be divided by 2 evenly. Odd numbers are the opposite of even numbers.
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## 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 61 in words is "sixty-one", meaning that: 61 is an aban number (a number without the letter a) 61 is not an eban number (as it contains the letter e) 61 is not an iban number (as it contains the letter i) 61 is not an oban number (as it contains the letter o) 61 is not a tban number (as it contains the letter t) 61 is an uban number (a number without the letter u)
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## Numeral systems

How to write 61 in other number systems?
 Bengali numerals ৬১ Eastern Arabic numerals ٦١ Hieroglyphs numeralsused in Ancient Egypt 𓎋𓏺 Khmer numerals ៦១ Japanese numerals 六十一 Roman numerals LXI Thai numerals ๖๑
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## Translation

How do you say 61 in 38 different languages?
 Arabic واحد و ستون Croatian šezdeset i jedan Czech šedesát jeden Danish en og tres Dutch éénenzestig Estonian blaade vɔ ɖekɛ Faroese seksti­ein Filipino anim na pû’t isá Finnish kuusi­kymmentä­yksi French soixante et un Greek εξήντα ένα German ein­und­sechzig Hebrew שישים ואחת Hindi इकसठ Hungarian hatvan­egy Icelandic sextíu og einn Indonesian enam puluh satu Italian sessantuno Japanese 六十一 Korean 육십일 Latvian sešdesmit viens Lithuanian šešiasdešimt vienas Norwegian seksti­én Persian شصت و یک Polish sześćdziesiąt jeden Portuguese sessenta e um Romanian şasezeci şi unu Russian шестьдесят один Serbian шездесет и један Slovak šesťdesiat­jeden Slovene šestdeset ena Spanish sesenta y uno Swahili sitini na moja Swedish sextioen Thai หก​สิบ​เอ็ด Turkish altmış bir Ukrainian шістдесят один Vietnamese sáu mươi mốt
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## Miscellaneous

 Number 61 reversed 16 ASCII Code 61 = Unicode Character U+003D = Unix Timestamp Thu, 01 Jan 1970 00:01:01 +0000
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