Compare 81281 vs 81285
| Property | 81281 | 81285 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 812811 | 31 × 51 × 54191 |
| Prime factorization | 81281 | 3 × 5 × 5419 |
| Divisors count | 2 | 8 |
| Divisors | 1, 81281 | 1, 3, 5, 15, 5419, 16257, 27095, 81285 |
| Number of properties | 7 | 0 |
| Centered decagonal primes | 61st | |
| Chen primes | 3597th | |
| Harmonic primes | 3002nd | |
| Primes | 7953rd | |
| Pythagorean primes | 3963rd | |
| Sophie germain primes | 988th | |
| Twin primes (1st member) | 1025th | |
| Roman numberals | ||
| Base 2 | 100111101100000012 | 100111101100001012 |
| Base 3 | 110101111023 | 110101111203 |
| Base 4 | 1033120014 | 1033120114 |
| Base 5 | 101001115 | 101001205 |
| Base 6 | 14241456 | 14241536 |
| Base 7 | 4556547 | 4556617 |
| Base 8 | 2366018 | 2366058 |
| Base 9 | 1334429 | 1334469 |
| Base 10 | 8128110 | 8128510 |
| Base 11 | 5608211 | 5608611 |
| Base 12 | 3b05512 | 3b05912 |
| Base 13 | 2acc513 | 2acc913 |
| Base 14 | 2189b14 | 218a114 |
| Base 15 | 1913b15 | 1914015 |
| Base 16 | 13d8116 | 13d8516 |