Compare 1657 vs 1987
| Property | 1657 | 1987 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 16571 | 19871 |
| Prime factorization | 1657 | 1987 |
| Divisors count | 2 | 2 |
| Divisors | 1, 1657 | 1, 1987 |
| Number of properties | 8 | 6 |
| Additive primes | 139th | |
| Cuban primes 1 | 12th | |
| Emirps | 80th | |
| Good primes | 62nd | |
| Isolated primes | 157th | 181st |
| Lucky primes | 70th | |
| Primes | 260th | 300th |
| Pythagorean primes | 125th | |
| Sexy primes (1st member) | 112th | 127th |
| Sexy prime triplets (1st member) | 43rd | 50th |
| Roman numberals | MDCLVII | MCMLXXXVII |
| Base 2 | 110011110012 | 111110000112 |
| Base 3 | 20211013 | 22011213 |
| Base 4 | 1213214 | 1330034 |
| Base 5 | 231125 | 304225 |
| Base 6 | 114016 | 131116 |
| Base 7 | 45557 | 55367 |
| Base 8 | 31718 | 37038 |
| Base 9 | 22419 | 26479 |
| Base 10 | 165710 | 198710 |
| Base 11 | 127711 | 154711 |
| Base 12 | b6112 | 119712 |
| Base 13 | 9a613 | b9b13 |
| Base 14 | 86514 | a1d14 |
| Base 15 | 75715 | 8c715 |
| Base 16 | 67916 | 7c316 |