Compare 181 vs 193
| Property | 181 | 193 | 
|---|---|---|
| Type | prime | prime | 
| Unique factors | 1 | 1 | 
| Total factors | 1 | 1 | 
| Prime factorization | 1811 | 1931 | 
| Prime factorization | 181 | 193 | 
| Divisors count | 2 | 2 | 
| Divisors | 1, 181 | 1, 193 | 
| Number of properties | 8 | 18 | 
| Additive primes | 25th | |
| Centered square primes | 6th | |
| Chen primes | 33rd | |
| Cousin primes (1st member) | 14th | |
| Cuban primes 2 | 3rd | |
| Dihedral primes | 5th | |
| Happy primes | 12th | |
| Harmonic primes | 16th | |
| Long primes | 16th | 17th | 
| Lucky primes | 13th | |
| Palindromic primes | 9th | |
| Pierpont primes | 13th | |
| Primes | 42nd | 44th | 
| Prime quadruplets (2nd member) | 4th | |
| Prime triplets (1st member) | 14th | |
| Prime triplets (2nd member) | 13th | |
| Proth primes | 8th | |
| Pythagorean primes | 19th | 20th | 
| Sexy primes (1st member) | 26th | |
| Solinas primes | 26th | |
| Thabit primes of the 2nd kind | 4th | |
| Twin primes (2nd member) | 13th | 14th | 
| Roman numberals | CLXXXI | CXCIII | 
| Base 2 | 101101012 | 110000012 | 
| Base 3 | 202013 | 210113 | 
| Base 4 | 23114 | 30014 | 
| Base 5 | 12115 | 12335 | 
| Base 6 | 5016 | 5216 | 
| Base 7 | 3467 | 3647 | 
| Base 8 | 2658 | 3018 | 
| Base 9 | 2219 | 2349 | 
| Base 10 | 18110 | 19310 | 
| Base 11 | 15511 | 16611 | 
| Base 12 | 13112 | 14112 | 
| Base 13 | 10c13 | 11b13 | 
| Base 14 | cd14 | db14 | 
| Base 15 | c115 | cd15 | 
| Base 16 | b516 | c116 |