Compare 1286 vs 1289
| Property | 1286 | 1289 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 21 × 6431 | 12891 |
| Prime factorization | 2 × 643 | 1289 |
| Divisors count | 4 | 2 |
| Divisors | 1, 2, 643, 1286 | 1, 1289 |
| Number of properties | 1 | 7 |
| Chen primes | 136th | |
| Primes | 209th | |
| Pythagorean primes | 103rd | |
| Semiprimes | 379th | |
| Sexy primes (2nd member) | 90th | |
| Sexy prime triplets (3rd member) | 34th | |
| Sophie germain primes | 45th | |
| Twin primes (1st member) | 44th | |
| Roman numberals | MCCLXXXVI | MCCLXXXIX |
| Base 2 | 101000001102 | 101000010012 |
| Base 3 | 12021223 | 12022023 |
| Base 4 | 1100124 | 1100214 |
| Base 5 | 201215 | 201245 |
| Base 6 | 55426 | 55456 |
| Base 7 | 35157 | 35217 |
| Base 8 | 24068 | 24118 |
| Base 9 | 16789 | 16829 |
| Base 10 | 128610 | 128910 |
| Base 11 | a6a11 | a7211 |
| Base 12 | 8b212 | 8b512 |
| Base 13 | 77c13 | 78213 |
| Base 14 | 67c14 | 68114 |
| Base 15 | 5ab15 | 5ae15 |
| Base 16 | 50616 | 50916 |