Compare 1558 vs 1561
| Property | 1558 | 1561 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 3 | 2 |
| Prime factorization | 21 × 191 × 411 | 71 × 2231 |
| Prime factorization | 2 × 19 × 41 | 7 × 223 |
| Divisors count | 8 | 4 |
| Divisors | 1, 2, 19, 38, 41, 82, 779, 1558 | 1, 7, 223, 1561 |
| Number of properties | 0 | 1 |
| Semiprimes | 453rd | |
| Roman numberals | MDLVIII | MDLXI |
| Base 2 | 110000101102 | 110000110012 |
| Base 3 | 20102013 | 20102113 |
| Base 4 | 1201124 | 1201214 |
| Base 5 | 222135 | 222215 |
| Base 6 | 111146 | 111216 |
| Base 7 | 43547 | 43607 |
| Base 8 | 30268 | 30318 |
| Base 9 | 21219 | 21249 |
| Base 10 | 155810 | 156110 |
| Base 11 | 119711 | 119a11 |
| Base 12 | a9a12 | aa112 |
| Base 13 | 92b13 | 93113 |
| Base 14 | 7d414 | 7d714 |
| Base 15 | 6dd15 | 6e115 |
| Base 16 | 61616 | 61916 |