Compare 221807 vs 221809
| Property | 221807 | 221809 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 2218071 | 71 × 316871 |
| Prime factorization | 221807 | 7 × 31687 |
| Divisors count | 2 | 4 |
| Divisors | 1, 221807 | 1, 7, 31687, 221809 |
| Number of properties | 6 | 1 |
| Chen primes | 8234th | |
| Harmonic primes | 7418th | |
| Isolated primes | 15073rd | |
| Primes | 19762nd | |
| Semiprimes | 49905th | |
| Sexy primes (1st member) | 4676th | |
| Ulam primes | 1413th | |
| Roman numberals | ||
| Base 2 | 1101100010011011112 | 1101100010011100012 |
| Base 3 | 1020210210023 | 1020210210113 |
| Base 4 | 3120212334 | 3120213014 |
| Base 5 | 240442125 | 240442145 |
| Base 6 | 44305156 | 44305216 |
| Base 7 | 16124457 | 16124507 |
| Base 8 | 6611578 | 6611618 |
| Base 9 | 3672329 | 3672349 |
| Base 10 | 22180710 | 22180910 |
| Base 11 | 14171311 | 14171511 |
| Base 12 | a843b12 | a844112 |
| Base 13 | 79c6113 | 79c6313 |
| Base 14 | 5ab9514 | 5ab9714 |
| Base 15 | 45ac215 | 45ac415 |
| Base 16 | 3626f16 | 3627116 |