Compare 1561 vs 1591
| Property | 1561 | 1591 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 71 × 2231 | 371 × 431 |
| Prime factorization | 7 × 223 | 37 × 43 |
| Divisors count | 4 | 4 |
| Divisors | 1, 7, 223, 1561 | 1, 37, 43, 1591 |
| Number of properties | 1 | 1 |
| Semiprimes | 453rd | 461st |
| Roman numberals | MDLXI | MDXCI |
| Base 2 | 110000110012 | 110001101112 |
| Base 3 | 20102113 | 20112213 |
| Base 4 | 1201214 | 1203134 |
| Base 5 | 222215 | 223315 |
| Base 6 | 111216 | 112116 |
| Base 7 | 43607 | 44327 |
| Base 8 | 30318 | 30678 |
| Base 9 | 21249 | 21579 |
| Base 10 | 156110 | 159110 |
| Base 11 | 119a11 | 121711 |
| Base 12 | aa112 | b0712 |
| Base 13 | 93113 | 95513 |
| Base 14 | 7d714 | 81914 |
| Base 15 | 6e115 | 71115 |
| Base 16 | 61916 | 63716 |