Compare 1931 vs 1987
| Property | 1931 | 1987 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 19311 | 19871 |
| Prime factorization | 1931 | 1987 |
| Divisors count | 2 | 2 |
| Divisors | 1, 1931 | 1, 1987 |
| Number of properties | 5 | 6 |
| Chen primes | 182nd | |
| Good primes | 62nd | |
| Harmonic primes | 108th | |
| Isolated primes | 181st | |
| Lucky primes | 70th | |
| Primes | 294th | 300th |
| Sexy primes (1st member) | 127th | |
| Sexy prime triplets (1st member) | 50th | |
| Sophie germain primes | 59th | |
| Twin primes (1st member) | 59th | |
| Roman numberals | MCMXXXI | MCMLXXXVII |
| Base 2 | 111100010112 | 111110000112 |
| Base 3 | 21221123 | 22011213 |
| Base 4 | 1320234 | 1330034 |
| Base 5 | 302115 | 304225 |
| Base 6 | 125356 | 131116 |
| Base 7 | 54267 | 55367 |
| Base 8 | 36138 | 37038 |
| Base 9 | 25759 | 26479 |
| Base 10 | 193110 | 198710 |
| Base 11 | 14a611 | 154711 |
| Base 12 | 114b12 | 119712 |
| Base 13 | b5713 | b9b13 |
| Base 14 | 9bd14 | a1d14 |
| Base 15 | 88b15 | 8c715 |
| Base 16 | 78b16 | 7c316 |