Compare 1531 vs 1538
| Property | 1531 | 1538 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 15311 | 21 × 7691 |
| Prime factorization | 1531 | 2 × 769 |
| Divisors count | 2 | 4 |
| Divisors | 1, 1531 | 1, 2, 769, 1538 |
| Number of properties | 5 | 1 |
| Centered decagonal primes | 13th | |
| Isolated primes | 143rd | |
| Long primes | 91st | |
| Primes | 242nd | |
| Semiprimes | 449th | |
| Ulam primes | 22nd | |
| Roman numberals | MDXXXI | MDXXXVIII |
| Base 2 | 101111110112 | 110000000102 |
| Base 3 | 20022013 | 20022223 |
| Base 4 | 1133234 | 1200024 |
| Base 5 | 221115 | 221235 |
| Base 6 | 110316 | 110426 |
| Base 7 | 43157 | 43257 |
| Base 8 | 27738 | 30028 |
| Base 9 | 20819 | 20889 |
| Base 10 | 153110 | 153810 |
| Base 11 | 117211 | 117911 |
| Base 12 | a7712 | a8212 |
| Base 13 | 90a13 | 91413 |
| Base 14 | 7b514 | 7bc14 |
| Base 15 | 6c115 | 6c815 |
| Base 16 | 5fb16 | 60216 |