odd, prime · 257th positive integer
The number 257
257 is an odd prime number. It is the 257th positive integer.
Quick reference
| Prime factorization | 257 (prime) |
| Divisors | 1, 257 |
| Binary | 100000001 |
| Hexadecimal | 0x101 |
| Roman numeral | CCLVII |
| Digit sum | 14 |
| Properties | odd, prime |
Frequently asked
Is 257 a prime number?
Yes. 257 is prime — its only divisors are 1 and itself.
What are the factors of 257?
The factors (divisors) of 257 are 1, 257.
What is 257 in binary?
257 in binary is 100000001. In hexadecimal it's 101.
What is 257 as a Roman numeral?
257 in Roman numerals is CCLVII.
What's the digit sum of 257?
Adding the digits of 257: 2 + 5 + 7 = 14.