Compare 18181 vs 19991
| Property | 18181 | 19991 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 181811 | 199911 |
| Prime factorization | 18181 | 19991 |
| Divisors count | 2 | 2 |
| Divisors | 1, 18181 | 1, 19991 |
| Number of properties | 9 | 9 |
| Additive primes | 979th | 1049th |
| Chen primes | 1111th | |
| Dihedral primes | 8th | |
| Harmonic primes | 754th | 820th |
| Isolated primes | 1444th | |
| Lucky primes | 341st | |
| Palindromic primes | 42nd | 46th |
| Primes | 2083rd | 2260th |
| Prime triplets (1st member) | 168th | |
| Pythagorean primes | 1029th | |
| Sexy primes (1st member) | 693rd | |
| Sophie germain primes | 326th | |
| Super primes | 314th | |
| Twin primes (1st member) | 342nd | |
| Roman numberals | ||
| Base 2 | 1000111000001012 | 1001110000101112 |
| Base 3 | 2202211013 | 10001021023 |
| Base 4 | 101300114 | 103201134 |
| Base 5 | 10402115 | 11144315 |
| Base 6 | 2201016 | 2323156 |
| Base 7 | 1040027 | 1121667 |
| Base 8 | 434058 | 470278 |
| Base 9 | 268419 | 303729 |
| Base 10 | 1818110 | 1999110 |
| Base 11 | 1272911 | 1402411 |
| Base 12 | a63112 | b69b12 |
| Base 13 | 837713 | 913a13 |
| Base 14 | 68a914 | 73dd14 |
| Base 15 | 55c115 | 5dcb15 |
| Base 16 | 470516 | 4e1716 |