Compare 1987 vs 2531
| Property | 1987 | 2531 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 19871 | 25311 |
| Prime factorization | 1987 | 2531 |
| Divisors count | 2 | 2 |
| Divisors | 1, 1987 | 1, 2531 |
| Number of properties | 6 | 7 |
| Additive primes | 193rd | |
| Centered decagonal primes | 16th | |
| Chen primes | 223rd | |
| Good primes | 62nd | 72nd |
| Harmonic primes | 139th | |
| Isolated primes | 181st | 227th |
| Lucky primes | 70th | |
| Primes | 300th | 370th |
| Sexy primes (1st member) | 127th | |
| Sexy prime triplets (1st member) | 50th | |
| Roman numberals | MCMLXXXVII | MMDXXXI |
| Base 2 | 111110000112 | 1001111000112 |
| Base 3 | 22011213 | 101102023 |
| Base 4 | 1330034 | 2132034 |
| Base 5 | 304225 | 401115 |
| Base 6 | 131116 | 154156 |
| Base 7 | 55367 | 102447 |
| Base 8 | 37038 | 47438 |
| Base 9 | 26479 | 34229 |
| Base 10 | 198710 | 253110 |
| Base 11 | 154711 | 19a111 |
| Base 12 | 119712 | 156b12 |
| Base 13 | b9b13 | 11c913 |
| Base 14 | a1d14 | ccb14 |
| Base 15 | 8c715 | b3b15 |
| Base 16 | 7c316 | 9e316 |