Compare 209 vs 215
| Property | 209 | 215 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 111 × 191 | 51 × 431 |
| Prime factorization | 11 × 19 | 5 × 43 |
| Divisors count | 4 | 4 |
| Divisors | 1, 11, 19, 209 | 1, 5, 43, 215 |
| Number of properties | 1 | 1 |
| Semiprimes | 68th | 71st |
| Roman numberals | CCIX | CCXV |
| Base 2 | 110100012 | 110101112 |
| Base 3 | 212023 | 212223 |
| Base 4 | 31014 | 31134 |
| Base 5 | 13145 | 13305 |
| Base 6 | 5456 | 5556 |
| Base 7 | 4167 | 4257 |
| Base 8 | 3218 | 3278 |
| Base 9 | 2529 | 2589 |
| Base 10 | 20910 | 21510 |
| Base 11 | 18011 | 18611 |
| Base 12 | 15512 | 15b12 |
| Base 13 | 13113 | 13713 |
| Base 14 | 10d14 | 11514 |
| Base 15 | de15 | e515 |
| Base 16 | d116 | d716 |