Compare 81 vs 83
| Property | 81 | 83 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 1 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 34 | 831 |
| Prime factorization | 3 × 3 × 3 × 3 | 83 |
| Divisors count | 5 | 2 |
| Divisors | 1, 3, 9, 27, 81 | 1, 83 |
| Number of properties | 0 | 10 |
| Additive primes | 13th | |
| Chen primes | 19th | |
| Cousin primes (2nd member) | 8th | |
| Isolated primes | 8th | |
| Left-truncatable primes | 14th | |
| Primes | 23rd | |
| Safe primes | 7th | |
| Sexy primes (1st member) | 15th | |
| Sophie germain primes | 9th | |
| Super primes | 9th | |
| Roman numberals | LXXXI | LXXXIII |
| Base 2 | 10100012 | 10100112 |
| Base 3 | 100003 | 100023 |
| Base 4 | 11014 | 11034 |
| Base 5 | 3115 | 3135 |
| Base 6 | 2136 | 2156 |
| Base 7 | 1447 | 1467 |
| Base 8 | 1218 | 1238 |
| Base 9 | 1009 | 1029 |
| Base 10 | 8110 | 8310 |
| Base 11 | 7411 | 7611 |
| Base 12 | 6912 | 6b12 |
| Base 13 | 6313 | 6513 |
| Base 14 | 5b14 | 5d14 |
| Base 15 | 5615 | 5815 |
| Base 16 | 5116 | 5316 |