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Number 51 (fifty-one) is an odd two-digits composite number and natural number following 50 and preceding 52.

Properties of the number 51

Number of digits2
Sum of digits6
Product of digits5
Number parityOdd
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Prime Factorization of 51

Prime factorization3 x 17
Prime factors3, 17
Number of distinct prime factors ω(n)2
Total number of prime factors Ω(n)2
Sum of prime factors20
Product of prime factors51
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Divisors of 51

List of proper divisors 1, 3, 17
List of all dividers1, 3, 17, 51
Number of divisors d(n)4
Sum of all divisors σ(n)72
Aliquot sum 21
51 is a deficient number , since it is larger than the sum of its proper divisors (21). Its deficiency is 30.
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Prime numbers

Is 51 a prime number?No
Is 51 a semiprime number?Yes
Is 51 a Chen prime number?No
Is 51 a Mersenne prime number?No
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Is 51 a Catalan number?No
Is 51 a Fibonacci number?No
Is 51 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.
51 is not a Happy number
51 is not a Humble number
51 is not a Münchhausen number
51 is not a Perfect number
51 is not a Perfect square
51 is not a Palindrome
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Numeric Bases of 51

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 51 (n2)2601
Cube of 51 (n3)132651
Square root of 517.1414284285429
Natural Logarithm (ln) of 513.9318256327243
Decimal Logarithm (log) of 511.7075701760979
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Trigonometry is the study of the relationship between the angles and sides of a triangle.
Sine of 510.67022917584337
Cosecant of 511.4920269603926
Cosine of 510.74215419681378
Secant of 511.3474288824252
Tangent of 510.90308614937543
Cotangent of 511.1073140704146
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Number parity

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

Is 51 an Even Number?


Is 51 an Odd Number?

Yes, the number 51 is an odd number.
Total number of all odd numbers from 1 to 51 is 26
Sum of all the odd numbers from 1 to 51 are 676
The sum of all odd numbers is a perfect square: 676 = 26
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 51 in words is "fifty-one", meaning that:
51 is an aban number (a number without the letter a)
51 is not an eban number (as it contains the letter e)
51 is not an iban number (as it contains the letter i)
51 is not an oban number (as it contains the letter o)
51 is not a tban number (as it contains the letter t)
51 is an uban number (a number without the letter u)
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Numeral systems

How to write 51 in other number systems?
Bengali numerals৫১
Eastern Arabic numerals٥١
Hieroglyphs numeralsused in Ancient Egypt𓎊𓏺
Khmer numerals៥១
Japanese numerals五十一
Roman numeralsLI
Thai numerals๕๑
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How do you say 51 in 38 different languages?
Arabicواحد و خمسون
Croatianpedeset i jedan
Czechpadesát jeden
Danish en og halvtreds
Estonianblaatɔ̃ vɔ ɖekɛ
Filipinolimáng pû’t isá
Frenchcinquante et un
Greekπενήντα ένα
Hebrewחמישים ואחת
Icelandicfimmtíu og einn
Indonesianlima puluh satu
Latvianpiecdesmit viens
Lithuanianpenkiasdešimt vienas
Persianپنجاه و یک
Polishpięćdziesiąt jeden
Portuguesecinquenta e um
Romaniancincizeci şi unu
Russianпятьдесят один
Serbianпедесет и један
Slovenepetdeset ena
Spanish cincuenta y uno
Swahilihamsini na moja
Turkishelli bir
Ukrainianпʼятдесят один
Vietnamesenăm mươi mốt
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Number 51 reversed15
ASCII Code513
Unicode CharacterU+00333
Unix TimestampThu, 01 Jan 1970 00:00:51 +0000
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