Compare 991 vs 1201
| Property | 991 | 1201 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 9911 | 12011 |
| Prime factorization | 991 | 1201 |
| Divisors count | 2 | 2 |
| Divisors | 1, 991 | 1, 1201 |
| Number of properties | 10 | 11 |
| Additive primes | 89th | |
| Centered decagonal primes | 11th | |
| Centered square primes | 12th | |
| Chen primes | 115th | 130th |
| Cuban primes 2 | 6th | |
| Emirps | 36th | 51st |
| Harmonic primes | 69th | |
| Isolated primes | 98th | 116th |
| Lucky primes | 42nd | 51st |
| Primes | 167th | 197th |
| Pythagorean primes | 96th | |
| Sexy primes (1st member) | 74th | |
| Solinas primes | 43rd | |
| Super primes | 39th | 45th |
| Ulam primes | 18th | |
| Roman numberals | CMXCI | MCCI |
| Base 2 | 11110111112 | 100101100012 |
| Base 3 | 11002013 | 11221113 |
| Base 4 | 331334 | 1023014 |
| Base 5 | 124315 | 143015 |
| Base 6 | 43316 | 53216 |
| Base 7 | 26147 | 33347 |
| Base 8 | 17378 | 22618 |
| Base 9 | 13219 | 15749 |
| Base 10 | 99110 | 120110 |
| Base 11 | 82111 | 9a211 |
| Base 12 | 6a712 | 84112 |
| Base 13 | 5b313 | 71513 |
| Base 14 | 50b14 | 61b14 |
| Base 15 | 46115 | 55115 |
| Base 16 | 3df16 | 4b116 |