Compare 251 vs 557
| Property | 251 | 557 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 2511 | 5571 |
| Prime factorization | 251 | 557 |
| Divisors count | 2 | 2 |
| Divisors | 1, 251 | 1, 557 |
| Number of properties | 10 | 9 |
| Additive primes | 55th | |
| Chen primes | 41st | 72nd |
| Good primes | 19th | 29th |
| Harmonic primes | 20th | 43rd |
| Isolated primes | 21st | 53rd |
| Primes | 54th | 102nd |
| Pythagorean primes | 48th | |
| Sexy primes (1st member) | 30th | 49th |
| Sexy prime quadrupletss (1st member) | 5th | |
| Sexy prime triplets (1st member) | 15th | 20th |
| Solinas primes | 30th | |
| Sophie germain primes | 18th | |
| Roman numberals | CCLI | DLVII |
| Base 2 | 111110112 | 10001011012 |
| Base 3 | 1000223 | 2021223 |
| Base 4 | 33234 | 202314 |
| Base 5 | 20015 | 42125 |
| Base 6 | 10556 | 23256 |
| Base 7 | 5067 | 14247 |
| Base 8 | 3738 | 10558 |
| Base 9 | 3089 | 6789 |
| Base 10 | 25110 | 55710 |
| Base 11 | 20911 | 46711 |
| Base 12 | 18b12 | 3a512 |
| Base 13 | 16413 | 33b13 |
| Base 14 | 13d14 | 2bb14 |
| Base 15 | 11b15 | 27215 |
| Base 16 | fb16 | 22d16 |