Compare 18905 vs 18911
| Property | 18905 | 18911 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 51 × 191 × 1991 | 189111 |
| Prime factorization | 5 × 19 × 199 | 18911 |
| Divisors count | 8 | 2 |
| Divisors | 1, 5, 19, 95, 199, 995, 3781, 18905 | 1, 18911 |
| Number of properties | 0 | 10 |
| Centered decagonal primes | 32nd | |
| Chen primes | 1066th | |
| Emirps | 590th | |
| Good primes | 247th | |
| Harmonic primes | 775th | |
| Primes | 2151st | |
| Prime quadruplets (1st member) | 18th | |
| Prime triplets (1st member) | 161st | |
| Sexy primes (1st member) | 658th | |
| Twin primes (1st member) | 326th | |
| Roman numberals | ||
| Base 2 | 1001001110110012 | 1001001110111112 |
| Base 3 | 2212210123 | 2212211023 |
| Base 4 | 102131214 | 102131334 |
| Base 5 | 11011105 | 11011215 |
| Base 6 | 2233056 | 2233156 |
| Base 7 | 1060557 | 1060647 |
| Base 8 | 447318 | 447378 |
| Base 9 | 278359 | 278429 |
| Base 10 | 1890510 | 1891110 |
| Base 11 | 1322711 | 1323211 |
| Base 12 | ab3512 | ab3b12 |
| Base 13 | 87b313 | 87b913 |
| Base 14 | 6c6514 | 6c6b14 |
| Base 15 | 590515 | 590b15 |
| Base 16 | 49d916 | 49df16 |