Compare 521 vs 557
| Property | 521 | 557 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 5211 | 5571 |
| Prime factorization | 521 | 557 |
| Divisors count | 2 | 2 |
| Divisors | 1, 521 | 1, 557 |
| Number of properties | 6 | 9 |
| Additive primes | 55th | |
| Chen primes | 70th | 72nd |
| Good primes | 29th | |
| Harmonic primes | 43rd | |
| Isolated primes | 53rd | |
| Lucas primes | 8th | |
| Primes | 98th | 102nd |
| Pythagorean primes | 46th | 48th |
| Sexy primes (1st member) | 49th | |
| Sexy prime triplets (1st member) | 20th | |
| Solinas primes | 39th | |
| Twin primes (1st member) | 25th | |
| Roman numberals | DXXI | DLVII |
| Base 2 | 10000010012 | 10001011012 |
| Base 3 | 2010223 | 2021223 |
| Base 4 | 200214 | 202314 |
| Base 5 | 40415 | 42125 |
| Base 6 | 22256 | 23256 |
| Base 7 | 13437 | 14247 |
| Base 8 | 10118 | 10558 |
| Base 9 | 6389 | 6789 |
| Base 10 | 52110 | 55710 |
| Base 11 | 43411 | 46711 |
| Base 12 | 37512 | 3a512 |
| Base 13 | 31113 | 33b13 |
| Base 14 | 29314 | 2bb14 |
| Base 15 | 24b15 | 27215 |
| Base 16 | 20916 | 22d16 |