Compare 1561 vs 1566
| Property | 1561 | 1566 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 3 |
| Total factors | 2 | 5 |
| Prime factorization | 71 × 2231 | 21 × 33 × 291 |
| Prime factorization | 7 × 223 | 2 × 3 × 3 × 3 × 29 |
| Divisors count | 4 | 16 |
| Divisors | 1, 7, 223, 1561 | 1, 2, 3, 6, 9, 18, 27, 29, 54, 58, 87, 174, 261, 522, 783, 1566 |
| Number of properties | 1 | 0 |
| Semiprimes | 453rd | |
| Roman numberals | MDLXI | MDLXVI |
| Base 2 | 110000110012 | 110000111102 |
| Base 3 | 20102113 | 20110003 |
| Base 4 | 1201214 | 1201324 |
| Base 5 | 222215 | 222315 |
| Base 6 | 111216 | 111306 |
| Base 7 | 43607 | 43657 |
| Base 8 | 30318 | 30368 |
| Base 9 | 21249 | 21309 |
| Base 10 | 156110 | 156610 |
| Base 11 | 119a11 | 11a411 |
| Base 12 | aa112 | aa612 |
| Base 13 | 93113 | 93613 |
| Base 14 | 7d714 | 7dc14 |
| Base 15 | 6e115 | 6e615 |
| Base 16 | 61916 | 61e16 |