Compare 1813 vs 1821
| Property | 1813 | 1821 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 3 | 2 |
| Prime factorization | 72 × 371 | 31 × 6071 |
| Prime factorization | 7 × 7 × 37 | 3 × 607 |
| Divisors count | 6 | 4 |
| Divisors | 1, 7, 37, 49, 259, 1813 | 1, 3, 607, 1821 |
| Number of properties | 0 | 1 |
| Semiprimes | 524th | |
| Roman numberals | MDCCCXIII | MDCCCXXI |
| Base 2 | 111000101012 | 111000111012 |
| Base 3 | 21110113 | 21111103 |
| Base 4 | 1301114 | 1301314 |
| Base 5 | 242235 | 242415 |
| Base 6 | 122216 | 122336 |
| Base 7 | 52007 | 52117 |
| Base 8 | 34258 | 34358 |
| Base 9 | 24349 | 24439 |
| Base 10 | 181310 | 182110 |
| Base 11 | 13a911 | 140611 |
| Base 12 | 107112 | 107912 |
| Base 13 | a9613 | aa113 |
| Base 14 | 93714 | 94114 |
| Base 15 | 80d15 | 81615 |
| Base 16 | 71516 | 71d16 |