Compare 551 vs 557
| Property | 551 | 557 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 191 × 291 | 5571 |
| Prime factorization | 19 × 29 | 557 |
| Divisors count | 4 | 2 |
| Divisors | 1, 19, 29, 551 | 1, 557 |
| Number of properties | 1 | 9 |
| Additive primes | 55th | |
| Chen primes | 72nd | |
| Good primes | 29th | |
| Harmonic primes | 43rd | |
| Isolated primes | 53rd | |
| Primes | 102nd | |
| Pythagorean primes | 48th | |
| Semiprimes | 172nd | |
| Sexy primes (1st member) | 49th | |
| Sexy prime triplets (1st member) | 20th | |
| Roman numberals | DLI | DLVII |
| Base 2 | 10001001112 | 10001011012 |
| Base 3 | 2021023 | 2021223 |
| Base 4 | 202134 | 202314 |
| Base 5 | 42015 | 42125 |
| Base 6 | 23156 | 23256 |
| Base 7 | 14157 | 14247 |
| Base 8 | 10478 | 10558 |
| Base 9 | 6729 | 6789 |
| Base 10 | 55110 | 55710 |
| Base 11 | 46111 | 46711 |
| Base 12 | 39b12 | 3a512 |
| Base 13 | 33513 | 33b13 |
| Base 14 | 2b514 | 2bb14 |
| Base 15 | 26b15 | 27215 |
| Base 16 | 22716 | 22d16 |