Compare 1285 vs 1287
| Property | 1285 | 1287 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 3 |
| Total factors | 2 | 4 |
| Prime factorization | 51 × 2571 | 32 × 111 × 131 |
| Prime factorization | 5 × 257 | 3 × 3 × 11 × 13 |
| Divisors count | 4 | 12 |
| Divisors | 1, 5, 257, 1285 | 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429, 1287 |
| Number of properties | 1 | 0 |
| Semiprimes | 378th | |
| Roman numberals | MCCLXXXV | MCCLXXXVII |
| Base 2 | 101000001012 | 101000001112 |
| Base 3 | 12021213 | 12022003 |
| Base 4 | 1100114 | 1100134 |
| Base 5 | 201205 | 201225 |
| Base 6 | 55416 | 55436 |
| Base 7 | 35147 | 35167 |
| Base 8 | 24058 | 24078 |
| Base 9 | 16779 | 16809 |
| Base 10 | 128510 | 128710 |
| Base 11 | a6911 | a7011 |
| Base 12 | 8b112 | 8b312 |
| Base 13 | 77b13 | 78013 |
| Base 14 | 67b14 | 67d14 |
| Base 15 | 5aa15 | 5ac15 |
| Base 16 | 50516 | 50716 |