Compare 1985 vs 1987
| Property | 1985 | 1987 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 51 × 3971 | 19871 |
| Prime factorization | 5 × 397 | 1987 |
| Divisors count | 4 | 2 |
| Divisors | 1, 5, 397, 1985 | 1, 1987 |
| Number of properties | 1 | 6 |
| Good primes | 62nd | |
| Isolated primes | 181st | |
| Lucky primes | 70th | |
| Primes | 300th | |
| Semiprimes | 575th | |
| Sexy primes (1st member) | 127th | |
| Sexy prime triplets (1st member) | 50th | |
| Roman numberals | MCMLXXXV | MCMLXXXVII |
| Base 2 | 111110000012 | 111110000112 |
| Base 3 | 22011123 | 22011213 |
| Base 4 | 1330014 | 1330034 |
| Base 5 | 304205 | 304225 |
| Base 6 | 131056 | 131116 |
| Base 7 | 55347 | 55367 |
| Base 8 | 37018 | 37038 |
| Base 9 | 26459 | 26479 |
| Base 10 | 198510 | 198710 |
| Base 11 | 154511 | 154711 |
| Base 12 | 119512 | 119712 |
| Base 13 | b9913 | b9b13 |
| Base 14 | a1b14 | a1d14 |
| Base 15 | 8c515 | 8c715 |
| Base 16 | 7c116 | 7c316 |