Compare 1861 vs 1872
| Property | 1861 | 1872 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 7 |
| Prime factorization | 18611 | 24 × 32 × 131 |
| Prime factorization | 1861 | 2 × 2 × 2 × 2 × 3 × 3 × 13 |
| Divisors count | 2 | 30 |
| Divisors | 1, 1861 | 1, 2, 3, 4, 6, 8, 9, 12, 13, 16, 18, 24, 26, 36, 39, 48, 52, 72, 78, 104, 117, 144, 156, 208, 234, 312, 468, 624, 936, 1872 |
| Number of properties | 10 | 0 |
| 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 | MDCCCLXI | MDCCCLXXII |
| Base 2 | 111010001012 | 111010100002 |
| Base 3 | 21122213 | 21201003 |
| Base 4 | 1310114 | 1311004 |
| Base 5 | 244215 | 244425 |
| Base 6 | 123416 | 124006 |
| Base 7 | 52667 | 53137 |
| Base 8 | 35058 | 35208 |
| Base 9 | 24879 | 25109 |
| Base 10 | 186110 | 187210 |
| Base 11 | 144211 | 145211 |
| Base 12 | 10b112 | 110012 |
| Base 13 | b0213 | b1013 |
| Base 14 | 96d14 | 97a14 |
| Base 15 | 84115 | 84c15 |
| Base 16 | 74516 | 75016 |