Compare 90 vs 101
| Property | 90 | 101 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 21 × 32 × 51 | 1011 |
| Prime factorization | 2 × 3 × 3 × 5 | 101 |
| Divisors count | 12 | 2 |
| Divisors | 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 | 1, 101 |
| Number of properties | 0 | 18 |
| Additive primes | 15th | |
| Centered decagonal primes | 4th | |
| Chen primes | 21st | |
| Cousin primes (2nd member) | 9th | |
| Dihedral primes | 4th | |
| Good primes | 12th | |
| Palindromic primes | 6th | |
| Primes | 26th | |
| Prime quadruplets (1st member) | 3rd | |
| Prime quintuplet 1s (2nd member) | 2nd | |
| Prime quintuplet 2s (1st member) | 3rd | |
| Prime sextuplets (2nd member) | 2nd | |
| Prime triplets (1st member) | 10th | |
| Prime triplets (2nd member) | 9th | |
| Pythagorean primes | 12th | |
| Sexy primes (1st member) | 17th | |
| Sexy prime triplets (1st member) | 11th | |
| Twin primes (1st member) | 9th | |
| Roman numberals | XC | CI |
| Base 2 | 10110102 | 11001012 |
| Base 3 | 101003 | 102023 |
| Base 4 | 11224 | 12114 |
| Base 5 | 3305 | 4015 |
| Base 6 | 2306 | 2456 |
| Base 7 | 1567 | 2037 |
| Base 8 | 1328 | 1458 |
| Base 9 | 1109 | 1229 |
| Base 10 | 9010 | 10110 |
| Base 11 | 8211 | 9211 |
| Base 12 | 7612 | 8512 |
| Base 13 | 6c13 | 7a13 |
| Base 14 | 6614 | 7314 |
| Base 15 | 6015 | 6b15 |
| Base 16 | 5a16 | 6516 |