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

Properties of the number 61

Number of digits2
Sum of digits7
Product of digits6
Number parityOdd
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Prime Factorization of 61

Prime factorization61
Prime factors61
Number of distinct prime factors ω(n)1
Total number of prime factors Ω(n)1
Sum of prime factors61
Product of prime factors61
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Divisors of 61

List of proper divisors 1
List of all dividers1, 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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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.
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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 617.8102496759067
Natural Logarithm (ln) of 614.1108738641733
Decimal Logarithm (log) of 611.7853298350108
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Trigonometry is the study of the relationship between the angles and sides of a triangle.
Sine of 61-0.96611777000839
Cosecant of 61-1.0350704966241
Cosine of 61-0.25810163593827
Secant of 61-3.8744427030256
Tangent of 613.7431679442724
Cotangent of 610.26715338849013
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Number parity

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

Is 61 an Even Number?


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 numerals৬১
Eastern Arabic numerals٦١
Hieroglyphs numeralsused in Ancient Egypt𓎋𓏺
Khmer numerals៦១
Japanese numerals六十一
Roman numeralsLXI
Thai numerals๖๑
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How do you say 61 in 38 different languages?
Arabicواحد و ستون
Croatianšezdeset i jedan
Czechšedesát jeden
Danish en og tres
Estonianblaade vɔ ɖekɛ
Filipinoanim na pû’t isá
Frenchsoixante et un
Greekεξήντα ένα
Hebrewשישים ואחת
Icelandicsextíu og einn
Indonesianenam puluh satu
Latviansešdesmit viens
Lithuanianšešiasdešimt vienas
Persianشصت و یک
Polishsześćdziesiąt jeden
Portuguesesessenta e um
Romanianşasezeci şi unu
Russianшестьдесят один
Serbianшездесет и један
Slovenešestdeset ena
Spanish sesenta y uno
Swahilisitini na moja
Turkishaltmış bir
Ukrainianшістдесят один
Vietnamesesáu mươi mốt
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Number 61 reversed16
ASCII Code61=
Unicode CharacterU+003D=
Unix TimestampThu, 01 Jan 1970 00:01:01 +0000
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