Compare 1561 vs 1563
| Property | 1561 | 1563 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 71 × 2231 | 31 × 5211 |
| Prime factorization | 7 × 223 | 3 × 521 |
| Divisors count | 4 | 4 |
| Divisors | 1, 7, 223, 1561 | 1, 3, 521, 1563 |
| Number of properties | 1 | 1 |
| Semiprimes | 453rd | 454th |
| Roman numberals | MDLXI | MDLXIII |
| Base 2 | 110000110012 | 110000110112 |
| Base 3 | 20102113 | 20102203 |
| Base 4 | 1201214 | 1201234 |
| Base 5 | 222215 | 222235 |
| Base 6 | 111216 | 111236 |
| Base 7 | 43607 | 43627 |
| Base 8 | 30318 | 30338 |
| Base 9 | 21249 | 21269 |
| Base 10 | 156110 | 156310 |
| Base 11 | 119a11 | 11a111 |
| Base 12 | aa112 | aa312 |
| Base 13 | 93113 | 93313 |
| Base 14 | 7d714 | 7d914 |
| Base 15 | 6e115 | 6e315 |
| Base 16 | 61916 | 61b16 |