Compare 80 vs 91
| Property | 80 | 91 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 5 | 2 |
| Prime factorization | 24 × 51 | 71 × 131 |
| Prime factorization | 2 × 2 × 2 × 2 × 5 | 7 × 13 |
| Divisors count | 10 | 4 |
| Divisors | 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 | 1, 7, 13, 91 |
| Number of properties | 0 | 1 |
| Semiprimes | 31st | |
| Roman numberals | LXXX | XCI |
| Base 2 | 10100002 | 10110112 |
| Base 3 | 22223 | 101013 |
| Base 4 | 11004 | 11234 |
| Base 5 | 3105 | 3315 |
| Base 6 | 2126 | 2316 |
| Base 7 | 1437 | 1607 |
| Base 8 | 1208 | 1338 |
| Base 9 | 889 | 1119 |
| Base 10 | 8010 | 9110 |
| Base 11 | 7311 | 8311 |
| Base 12 | 6812 | 7712 |
| Base 13 | 6213 | 7013 |
| Base 14 | 5a14 | 6714 |
| Base 15 | 5515 | 6115 |
| Base 16 | 5016 | 5b16 |