Compare 1811 vs 1931
| Property | 1811 | 1931 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 18111 | 19311 |
| Prime factorization | 1811 | 1931 |
| Divisors count | 2 | 2 |
| Divisors | 1, 1811 | 1, 1931 |
| Number of properties | 8 | 5 |
| Additive primes | 149th | |
| Chen primes | 182nd | |
| Dihedral primes | 7th | |
| Emirps | 87th | |
| Harmonic primes | 100th | 108th |
| Isolated primes | 169th | |
| Long primes | 109th | |
| Primes | 280th | 294th |
| Sophie germain primes | 56th | 59th |
| Twin primes (1st member) | 59th | |
| Roman numberals | MDCCCXI | MCMXXXI |
| Base 2 | 111000100112 | 111100010112 |
| Base 3 | 21110023 | 21221123 |
| Base 4 | 1301034 | 1320234 |
| Base 5 | 242215 | 302115 |
| Base 6 | 122156 | 125356 |
| Base 7 | 51657 | 54267 |
| Base 8 | 34238 | 36138 |
| Base 9 | 24329 | 25759 |
| Base 10 | 181110 | 193110 |
| Base 11 | 13a711 | 14a611 |
| Base 12 | 106b12 | 114b12 |
| Base 13 | a9413 | b5713 |
| Base 14 | 93514 | 9bd14 |
| Base 15 | 80b15 | 88b15 |
| Base 16 | 71316 | 78b16 |