Compare 991 vs 1181
| Property | 991 | 1181 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 9911 | 11811 |
| Prime factorization | 991 | 1181 |
| Divisors count | 2 | 2 |
| Divisors | 1, 991 | 1, 1181 |
| Number of properties | 10 | 10 |
| Additive primes | 89th | 104th |
| Chen primes | 115th | |
| Dihedral primes | 6th | |
| Emirps | 36th | 49th |
| Harmonic primes | 68th | |
| Isolated primes | 98th | 113th |
| Long primes | 74th | |
| Lucky primes | 42nd | |
| Primes | 167th | 194th |
| Pythagorean primes | 94th | |
| Sexy primes (1st member) | 74th | 84th |
| Sexy prime triplets (1st member) | 32nd | |
| Solinas primes | 43rd | |
| Super primes | 39th | |
| Ulam primes | 18th | |
| Roman numberals | CMXCI | MCLXXXI |
| Base 2 | 11110111112 | 100100111012 |
| Base 3 | 11002013 | 11212023 |
| Base 4 | 331334 | 1021314 |
| Base 5 | 124315 | 142115 |
| Base 6 | 43316 | 52456 |
| Base 7 | 26147 | 33057 |
| Base 8 | 17378 | 22358 |
| Base 9 | 13219 | 15529 |
| Base 10 | 99110 | 118110 |
| Base 11 | 82111 | 98411 |
| Base 12 | 6a712 | 82512 |
| Base 13 | 5b313 | 6cb13 |
| Base 14 | 50b14 | 60514 |
| Base 15 | 46115 | 53b15 |
| Base 16 | 3df16 | 49d16 |