Compare 1975 vs 1987
| Property | 1975 | 1987 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 2 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 52 × 791 | 19871 |
| Prime factorization | 5 × 5 × 79 | 1987 |
| Divisors count | 6 | 2 |
| Divisors | 1, 5, 25, 79, 395, 1975 | 1, 1987 |
| Number of properties | 0 | 6 |
| Good primes | 62nd | |
| Isolated primes | 181st | |
| Lucky primes | 70th | |
| Primes | 300th | |
| Sexy primes (1st member) | 127th | |
| Sexy prime triplets (1st member) | 50th | |
| Roman numberals | MCMLXXV | MCMLXXXVII |
| Base 2 | 111101101112 | 111110000112 |
| Base 3 | 22010113 | 22011213 |
| Base 4 | 1323134 | 1330034 |
| Base 5 | 304005 | 304225 |
| Base 6 | 130516 | 131116 |
| Base 7 | 55217 | 55367 |
| Base 8 | 36678 | 37038 |
| Base 9 | 26349 | 26479 |
| Base 10 | 197510 | 198710 |
| Base 11 | 153611 | 154711 |
| Base 12 | 118712 | 119712 |
| Base 13 | b8c13 | b9b13 |
| Base 14 | a1114 | a1d14 |
| Base 15 | 8ba15 | 8c715 |
| Base 16 | 7b716 | 7c316 |