odd, composite · 51st positive integer
The number 51
51 is an odd composite number. It is the 51st positive integer.
Quick reference
| Prime factorization | 3 × 17 |
| Divisors | 1, 3, 17, 51 |
| Binary | 110011 |
| Hexadecimal | 0x33 |
| Roman numeral | LI |
| Digit sum | 6 |
| Properties | odd, composite |
Frequently asked
Is 51 a prime number?
No. 51 is composite. Its prime factorization is 3 × 17.
What are the factors of 51?
The factors (divisors) of 51 are 1, 3, 17, 51.
What is 51 in binary?
51 in binary is 110011. In hexadecimal it's 33.
What is 51 as a Roman numeral?
51 in Roman numerals is LI.
What's the digit sum of 51?
Adding the digits of 51: 5 + 1 = 6.