Compare 1555 vs 1561
| Property | 1555 | 1561 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 51 × 3111 | 71 × 2231 |
| Prime factorization | 5 × 311 | 7 × 223 |
| Divisors count | 4 | 4 |
| Divisors | 1, 5, 311, 1555 | 1, 7, 223, 1561 |
| Number of properties | 1 | 1 |
| Semiprimes | 452nd | 453rd |
| Roman numberals | MDLV | MDLXI |
| Base 2 | 110000100112 | 110000110012 |
| Base 3 | 20101213 | 20102113 |
| Base 4 | 1201034 | 1201214 |
| Base 5 | 222105 | 222215 |
| Base 6 | 111116 | 111216 |
| Base 7 | 43517 | 43607 |
| Base 8 | 30238 | 30318 |
| Base 9 | 21179 | 21249 |
| Base 10 | 155510 | 156110 |
| Base 11 | 119411 | 119a11 |
| Base 12 | a9712 | aa112 |
| Base 13 | 92813 | 93113 |
| Base 14 | 7d114 | 7d714 |
| Base 15 | 6da15 | 6e115 |
| Base 16 | 61316 | 61916 |