Compare 1285 vs 1289
| Property | 1285 | 1289 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 51 × 2571 | 12891 |
| Prime factorization | 5 × 257 | 1289 |
| Divisors count | 4 | 2 |
| Divisors | 1, 5, 257, 1285 | 1, 1289 |
| Number of properties | 1 | 7 |
| Chen primes | 136th | |
| Primes | 209th | |
| Pythagorean primes | 103rd | |
| Semiprimes | 378th | |
| Sexy primes (2nd member) | 90th | |
| Sexy prime triplets (3rd member) | 34th | |
| Sophie germain primes | 45th | |
| Twin primes (1st member) | 44th | |
| Roman numberals | MCCLXXXV | MCCLXXXIX |
| Base 2 | 101000001012 | 101000010012 |
| Base 3 | 12021213 | 12022023 |
| Base 4 | 1100114 | 1100214 |
| Base 5 | 201205 | 201245 |
| Base 6 | 55416 | 55456 |
| Base 7 | 35147 | 35217 |
| Base 8 | 24058 | 24118 |
| Base 9 | 16779 | 16829 |
| Base 10 | 128510 | 128910 |
| Base 11 | a6911 | a7211 |
| Base 12 | 8b112 | 8b512 |
| Base 13 | 77b13 | 78213 |
| Base 14 | 67b14 | 68114 |
| Base 15 | 5aa15 | 5ae15 |
| Base 16 | 50516 | 50916 |