Compare 169 vs 181
| Property | 169 | 181 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 1 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 132 | 1811 |
| Prime factorization | 13 × 13 | 181 |
| Divisors count | 3 | 2 |
| Divisors | 1, 13, 169 | 1, 181 |
| Number of properties | 1 | 8 |
| Centered square primes | 6th | |
| Chen primes | 33rd | |
| Dihedral primes | 5th | |
| Long primes | 16th | |
| Palindromic primes | 9th | |
| Primes | 42nd | |
| Pythagorean primes | 19th | |
| Semiprimes | 56th | |
| Twin primes (2nd member) | 13th | |
| Roman numberals | CLXIX | CLXXXI |
| Base 2 | 101010012 | 101101012 |
| Base 3 | 200213 | 202013 |
| Base 4 | 22214 | 23114 |
| Base 5 | 11345 | 12115 |
| Base 6 | 4416 | 5016 |
| Base 7 | 3317 | 3467 |
| Base 8 | 2518 | 2658 |
| Base 9 | 2079 | 2219 |
| Base 10 | 16910 | 18110 |
| Base 11 | 14411 | 15511 |
| Base 12 | 12112 | 13112 |
| Base 13 | 10013 | 10c13 |
| Base 14 | c114 | cd14 |
| Base 15 | b415 | c115 |
| Base 16 | a916 | b516 |