Compare 1855 vs 1861
| Property | 1855 | 1861 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 51 × 71 × 531 | 18611 |
| Prime factorization | 5 × 7 × 53 | 1861 |
| Divisors count | 8 | 2 |
| Divisors | 1, 5, 7, 35, 53, 265, 371, 1855 | 1, 1861 |
| Number of properties | 0 | 10 |
| Centered square primes | 15th | |
| Good primes | 58th | |
| Harmonic primes | 103rd | |
| Isolated primes | 173rd | |
| Long primes | 112th | |
| Primes | 284th | |
| Pythagorean primes | 137th | |
| Sexy primes (1st member) | 120th | |
| Sexy prime quadrupletss (1st member) | 12th | |
| Sexy prime triplets (1st member) | 47th | |
| Roman numberals | MDCCCLV | MDCCCLXI |
| Base 2 | 111001111112 | 111010001012 |
| Base 3 | 21122013 | 21122213 |
| Base 4 | 1303334 | 1310114 |
| Base 5 | 244105 | 244215 |
| Base 6 | 123316 | 123416 |
| Base 7 | 52607 | 52667 |
| Base 8 | 34778 | 35058 |
| Base 9 | 24819 | 24879 |
| Base 10 | 185510 | 186110 |
| Base 11 | 143711 | 144211 |
| Base 12 | 10a712 | 10b112 |
| Base 13 | ac913 | b0213 |
| Base 14 | 96714 | 96d14 |
| Base 15 | 83a15 | 84115 |
| Base 16 | 73f16 | 74516 |