Names of 51
| Nominal | 51 |
| Cardinal | fifty-one |
| Ordinal | 51st |
| This number as US currency | fifty-one dollars |
| Is 51 an odd number? | 51 is an odd number |
| Is 51 an even number? | 51 is NOT an even number |
| Is 51 a palindrome? | 51 is NOT a palindrome number |
| Is 51 a triangle number? | 51 is NOT a triangle number |
51 in other Bases
| Base 2 (Binary) | 1100112 |
| Base 3 (Ternary) | 12203 |
| Base 4 (Quaternary) | 3034 |
| Base 5 (Quinary) | 2015 |
| Base 6 (Senary) | 1236 |
| Base 8 (Octal) | 638 |
| Base 12 (Duodecimal) | 4312 |
| Base 16 (Hexadecimal) | 3316 |
| Base 20 (Vigesimal) | 2B20 |
Primes and Factors tests for 51
| Is 51 a Prime Number? | 51 is NOT a prime |
| Is 51 a perfect number? | 51 is NOT a perfect number |
| Is 51 a Mersenne Prime? | 51 is NOT a Mersenne prime |
| Is 51 a Fermat Prime? | 51 is NOT a Fermat prime |
| Is 51 a Fibonacci Prime? | 51 is NOT a Fibonacci prime |
| Is 51 a Partition Prime? | 51 is NOT a Partition prime |
| Is 51 a Pell Prime? | 51 is NOT a Pell prime |
| Prime Factors | Prime factors of 51 |
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51 in other Numerals
| 51 in Roman Numeral | LI |
| 51 in Chinese Numeral | 伍拾壹 |
| 51 in Egyptian Numeral | 𓎊𓏺 |
| 51 in Babylonian Numeral |  |
Roots and stuff for 51
| Is 51 a square number? | 51 is NOT a square number |
| Is 51 a cube number? | 51 is NOT a cube number |
| Square root of the number 51 | 7.1414284285429 |
| Cube root of the number 51 | 3.7084297692662 |
Recreational math for 51
| Number 51 reversed | 15 |
| Sum of the digits | 6 |
| No of digits | 2 |