Compare 178 vs 181
| Property | 178 | 181 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 21 × 891 | 1811 |
| Prime factorization | 2 × 89 | 181 |
| Divisors count | 4 | 2 |
| Divisors | 1, 2, 89, 178 | 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 | 58th | |
| Twin primes (2nd member) | 13th | |
| Roman numberals | CLXXVIII | CLXXXI |
| Base 2 | 101100102 | 101101012 |
| Base 3 | 201213 | 202013 |
| Base 4 | 23024 | 23114 |
| Base 5 | 12035 | 12115 |
| Base 6 | 4546 | 5016 |
| Base 7 | 3437 | 3467 |
| Base 8 | 2628 | 2658 |
| Base 9 | 2179 | 2219 |
| Base 10 | 17810 | 18110 |
| Base 11 | 15211 | 15511 |
| Base 12 | 12a12 | 13112 |
| Base 13 | 10913 | 10c13 |
| Base 14 | ca14 | cd14 |
| Base 15 | bd15 | c115 |
| Base 16 | b216 | b516 |