Compare 1861 vs 1889
| Property | 1861 | 1889 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 18611 | 18891 |
| Prime factorization | 1861 | 1889 |
| Divisors count | 2 | 2 |
| Divisors | 1, 1861 | 1, 1889 |
| Number of properties | 10 | 5 |
| Centered square primes | 15th | |
| Chen primes | 178th | |
| Good primes | 58th | |
| Harmonic primes | 103rd | |
| Isolated primes | 173rd | 175th |
| Long primes | 112th | |
| Primes | 284th | 290th |
| Pythagorean primes | 137th | 140th |
| Sexy primes (1st member) | 120th | |
| Sexy prime quadrupletss (1st member) | 12th | |
| Sexy prime triplets (1st member) | 47th | |
| Sophie germain primes | 57th | |
| Roman numberals | MDCCCLXI | MDCCCLXXXIX |
| Base 2 | 111010001012 | 111011000012 |
| Base 3 | 21122213 | 21202223 |
| Base 4 | 1310114 | 1312014 |
| Base 5 | 244215 | 300245 |
| Base 6 | 123416 | 124256 |
| Base 7 | 52667 | 53367 |
| Base 8 | 35058 | 35418 |
| Base 9 | 24879 | 25289 |
| Base 10 | 186110 | 188910 |
| Base 11 | 144211 | 146811 |
| Base 12 | 10b112 | 111512 |
| Base 13 | b0213 | b2413 |
| Base 14 | 96d14 | 98d14 |
| Base 15 | 84115 | 85e15 |
| Base 16 | 74516 | 76116 |