Compare 1805 vs 1811
| Property | 1805 | 1811 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 2 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 51 × 192 | 18111 |
| Prime factorization | 5 × 19 × 19 | 1811 |
| Divisors count | 6 | 2 |
| Divisors | 1, 5, 19, 95, 361, 1805 | 1, 1811 |
| Number of properties | 0 | 8 |
| Additive primes | 149th | |
| Dihedral primes | 7th | |
| Emirps | 87th | |
| Harmonic primes | 100th | |
| Isolated primes | 169th | |
| Long primes | 109th | |
| Primes | 280th | |
| Sophie germain primes | 56th | |
| Roman numberals | MDCCCV | MDCCCXI |
| Base 2 | 111000011012 | 111000100112 |
| Base 3 | 21102123 | 21110023 |
| Base 4 | 1300314 | 1301034 |
| Base 5 | 242105 | 242215 |
| Base 6 | 122056 | 122156 |
| Base 7 | 51567 | 51657 |
| Base 8 | 34158 | 34238 |
| Base 9 | 24259 | 24329 |
| Base 10 | 180510 | 181110 |
| Base 11 | 13a111 | 13a711 |
| Base 12 | 106512 | 106b12 |
| Base 13 | a8b13 | a9413 |
| Base 14 | 92d14 | 93514 |
| Base 15 | 80515 | 80b15 |
| Base 16 | 70d16 | 71316 |