Compare 255 vs 257
| Property | 255 | 257 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 31 × 51 × 171 | 2571 |
| Prime factorization | 3 × 5 × 17 | 257 |
| Divisors count | 8 | 2 |
| Divisors | 1, 3, 5, 15, 17, 51, 85, 255 | 1, 257 |
| Number of properties | 0 | 16 |
| Chen primes | 42nd | |
| Fermat primes | 4th | |
| Good primes | 20th | |
| Isolated primes | 22nd | |
| Long primes | 21st | |
| Pierpont primes | 14th | |
| Primes | 55th | |
| Proth primes | 10th | |
| Pythagorean primes | 25th | |
| Quartan primes | 4th | |
| Sexy primes (1st member) | 31st | |
| Sexy primes (2nd member) | 30th | |
| Sexy prime quadrupletss (2nd member) | 5th | |
| Sexy prime triplets (1st member) | 16th | |
| Sexy prime triplets (2nd member) | 15th | |
| Solinas primes | 31st | |
| Roman numberals | CCLV | CCLVII |
| Base 2 | 111111112 | 1000000012 |
| Base 3 | 1001103 | 1001123 |
| Base 4 | 33334 | 100014 |
| Base 5 | 20105 | 20125 |
| Base 6 | 11036 | 11056 |
| Base 7 | 5137 | 5157 |
| Base 8 | 3778 | 4018 |
| Base 9 | 3139 | 3159 |
| Base 10 | 25510 | 25710 |
| Base 11 | 21211 | 21411 |
| Base 12 | 19312 | 19512 |
| Base 13 | 16813 | 16a13 |
| Base 14 | 14314 | 14514 |
| Base 15 | 12015 | 12215 |
| Base 16 | ff16 | 10116 |