odd, composite · 255th positive integer
The number 255
255 is an odd composite number. It is the 255th positive integer.
Quick reference
| Prime factorization | 3 × 5 × 17 |
| Divisors | 1, 3, 5, 15, 17, 51, 85, 255 |
| Binary | 11111111 |
| Hexadecimal | 0xFF |
| Roman numeral | CCLV |
| Digit sum | 12 |
| Properties | odd, composite |
Frequently asked
Is 255 a prime number?
No. 255 is composite. Its prime factorization is 3 × 5 × 17.
What are the factors of 255?
The factors (divisors) of 255 are 1, 3, 5, 15, 17, 51, 85, 255.
What is 255 in binary?
255 in binary is 11111111. In hexadecimal it's FF.
What is 255 as a Roman numeral?
255 in Roman numerals is CCLV.
What's the digit sum of 255?
Adding the digits of 255: 2 + 5 + 5 = 12.