Compare 1809 vs 1821
| Property | 1809 | 1821 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 4 | 2 |
| Prime factorization | 33 × 671 | 31 × 6071 |
| Prime factorization | 3 × 3 × 3 × 67 | 3 × 607 |
| Divisors count | 8 | 4 |
| Divisors | 1, 3, 9, 27, 67, 201, 603, 1809 | 1, 3, 607, 1821 |
| Number of properties | 0 | 1 |
| Semiprimes | 524th | |
| Roman numberals | MDCCCIX | MDCCCXXI |
| Base 2 | 111000100012 | 111000111012 |
| Base 3 | 21110003 | 21111103 |
| Base 4 | 1301014 | 1301314 |
| Base 5 | 242145 | 242415 |
| Base 6 | 122136 | 122336 |
| Base 7 | 51637 | 52117 |
| Base 8 | 34218 | 34358 |
| Base 9 | 24309 | 24439 |
| Base 10 | 180910 | 182110 |
| Base 11 | 13a511 | 140611 |
| Base 12 | 106912 | 107912 |
| Base 13 | a9213 | aa113 |
| Base 14 | 93314 | 94114 |
| Base 15 | 80915 | 81615 |
| Base 16 | 71116 | 71d16 |