Compare 991 vs 1151
| Property | 991 | 1151 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 9911 | 11511 |
| Prime factorization | 991 | 1151 |
| Divisors count | 2 | 2 |
| Divisors | 1, 991 | 1, 1151 |
| Number of properties | 10 | 10 |
| Additive primes | 89th | |
| Chen primes | 115th | 126th |
| Class 1+ primes | 20th | |
| Emirps | 36th | 47th |
| Good primes | 48th | |
| Happy primes | 40th | |
| Isolated primes | 98th | |
| Lucky primes | 42nd | |
| Multiplicative primes | 15th | |
| Pierpont primes of the 2nd kind | 20th | |
| Primes | 167th | 190th |
| Sexy primes (1st member) | 74th | |
| Solinas primes | 43rd | 51st |
| Super primes | 39th | |
| Twin primes (1st member) | 41st | |
| Ulam primes | 18th | |
| Roman numberals | CMXCI | MCLI |
| Base 2 | 11110111112 | 100011111112 |
| Base 3 | 11002013 | 11201223 |
| Base 4 | 331334 | 1013334 |
| Base 5 | 124315 | 141015 |
| Base 6 | 43316 | 51556 |
| Base 7 | 26147 | 32337 |
| Base 8 | 17378 | 21778 |
| Base 9 | 13219 | 15189 |
| Base 10 | 99110 | 115110 |
| Base 11 | 82111 | 95711 |
| Base 12 | 6a712 | 7bb12 |
| Base 13 | 5b313 | 6a713 |
| Base 14 | 50b14 | 5c314 |
| Base 15 | 46115 | 51b15 |
| Base 16 | 3df16 | 47f16 |