Compare 209987 vs 209991
| Property | 209987 | 209991 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 2099871 | 31 × 699971 |
| Prime factorization | 209987 | 3 × 69997 |
| Divisors count | 2 | 4 |
| Divisors | 1, 209987 | 1, 3, 69997, 209991 |
| Number of properties | 4 | 1 |
| Cousin primes (2nd member) | 2225th | |
| Harmonic primes | 7041st | |
| Isolated primes | 14302nd | |
| Primes | 18807th | |
| Semiprimes | 47358th | |
| Roman numberals | ||
| Base 2 | 1100110100010000112 | 1100110100010001112 |
| Base 3 | 1012000010223 | 1012000011103 |
| Base 4 | 3031010034 | 3031010134 |
| Base 5 | 232044225 | 232044315 |
| Base 6 | 43000556 | 43001036 |
| Base 7 | 15331317 | 15331357 |
| Base 8 | 6321038 | 6321078 |
| Base 9 | 3500389 | 3500439 |
| Base 10 | 20998710 | 20999110 |
| Base 11 | 13384811 | 13385111 |
| Base 12 | a162b12 | a163312 |
| Base 13 | 7476b13 | 7477213 |
| Base 14 | 5675114 | 5675514 |
| Base 15 | 4234215 | 4234615 |
| Base 16 | 3344316 | 3344716 |