Compare 181 vs 421
| Property | 181 | 421 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 1811 | 4211 |
| Prime factorization | 181 | 421 |
| Divisors count | 2 | 2 |
| Divisors | 1, 181 | 1, 421 |
| Number of properties | 8 | 6 |
| Additive primes | 48th | |
| Centered square primes | 6th | 8th |
| Chen primes | 33rd | |
| Dihedral primes | 5th | |
| Long primes | 16th | |
| Lucky primes | 23rd | |
| Palindromic primes | 9th | |
| Primes | 42nd | 82nd |
| Pythagorean primes | 19th | 40th |
| Twin primes (2nd member) | 13th | 22nd |
| Roman numberals | CLXXXI | CDXXI |
| Base 2 | 101101012 | 1101001012 |
| Base 3 | 202013 | 1201213 |
| Base 4 | 23114 | 122114 |
| Base 5 | 12115 | 31415 |
| Base 6 | 5016 | 15416 |
| Base 7 | 3467 | 11417 |
| Base 8 | 2658 | 6458 |
| Base 9 | 2219 | 5179 |
| Base 10 | 18110 | 42110 |
| Base 11 | 15511 | 35311 |
| Base 12 | 13112 | 2b112 |
| Base 13 | 10c13 | 26513 |
| Base 14 | cd14 | 22114 |
| Base 15 | c115 | 1d115 |
| Base 16 | b516 | 1a516 |