Compare 1861 vs 1987
| Property | 1861 | 1987 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 18611 | 19871 |
| Prime factorization | 1861 | 1987 |
| Divisors count | 2 | 2 |
| Divisors | 1, 1861 | 1, 1987 |
| Number of properties | 10 | 6 |
| Centered square primes | 15th | |
| Good primes | 58th | 62nd |
| Harmonic primes | 103rd | |
| Isolated primes | 173rd | 181st |
| Long primes | 112th | |
| Lucky primes | 70th | |
| Primes | 284th | 300th |
| Pythagorean primes | 137th | |
| Sexy primes (1st member) | 120th | 127th |
| Sexy prime quadrupletss (1st member) | 12th | |
| Sexy prime triplets (1st member) | 47th | 50th |
| Roman numberals | MDCCCLXI | MCMLXXXVII |
| Base 2 | 111010001012 | 111110000112 |
| Base 3 | 21122213 | 22011213 |
| Base 4 | 1310114 | 1330034 |
| Base 5 | 244215 | 304225 |
| Base 6 | 123416 | 131116 |
| Base 7 | 52667 | 55367 |
| Base 8 | 35058 | 37038 |
| Base 9 | 24879 | 26479 |
| Base 10 | 186110 | 198710 |
| Base 11 | 144211 | 154711 |
| Base 12 | 10b112 | 119712 |
| Base 13 | b0213 | b9b13 |
| Base 14 | 96d14 | a1d14 |
| Base 15 | 84115 | 8c715 |
| Base 16 | 74516 | 7c316 |