Compare 1621 vs 1630
| Property | 1621 | 1630 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 16211 | 21 × 51 × 1631 |
| Prime factorization | 1621 | 2 × 5 × 163 |
| Divisors count | 2 | 8 |
| Divisors | 1, 1621 | 1, 2, 5, 10, 163, 326, 815, 1630 |
| Number of properties | 8 | 0 |
| Chen primes | 163rd | |
| Harmonic primes | 89th | |
| Long primes | 101st | |
| Primes | 257th | |
| Pythagorean primes | 123rd | |
| Sexy primes (1st member) | 111th | |
| Super primes | 55th | |
| Twin primes (2nd member) | 52nd | |
| Roman numberals | MDCXXI | MDCXXX |
| Base 2 | 110010101012 | 110010111102 |
| Base 3 | 20200013 | 20201013 |
| Base 4 | 1211114 | 1211324 |
| Base 5 | 224415 | 230105 |
| Base 6 | 113016 | 113146 |
| Base 7 | 45047 | 45167 |
| Base 8 | 31258 | 31368 |
| Base 9 | 22019 | 22119 |
| Base 10 | 162110 | 163010 |
| Base 11 | 124411 | 125211 |
| Base 12 | b3112 | b3a12 |
| Base 13 | 97913 | 98513 |
| Base 14 | 83b14 | 84614 |
| Base 15 | 73115 | 73a15 |
| Base 16 | 65516 | 65e16 |