Compare 991 vs 1447
| Property | 991 | 1447 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 9911 | 14471 |
| Prime factorization | 991 | 1447 |
| Divisors count | 2 | 2 |
| Divisors | 1, 991 | 1, 1447 |
| Number of properties | 10 | 9 |
| Additive primes | 89th | |
| Chen primes | 115th | |
| Cousin primes (1st member) | 51st | |
| Emirps | 36th | |
| Happy primes | 45th | |
| Isolated primes | 98th | 136th |
| Long primes | 89th | |
| Lucky primes | 42nd | |
| Primes | 167th | 229th |
| Prime triplets (1st member) | 38th | |
| Sexy primes (1st member) | 74th | 100th |
| Sexy prime triplets (1st member) | 38th | |
| Solinas primes | 43rd | |
| Super primes | 39th | 50th |
| Ulam primes | 18th | |
| Roman numberals | CMXCI | MCDXLVII |
| Base 2 | 11110111112 | 101101001112 |
| Base 3 | 11002013 | 12221213 |
| Base 4 | 331334 | 1122134 |
| Base 5 | 124315 | 212425 |
| Base 6 | 43316 | 104116 |
| Base 7 | 26147 | 41357 |
| Base 8 | 17378 | 26478 |
| Base 9 | 13219 | 18779 |
| Base 10 | 99110 | 144710 |
| Base 11 | 82111 | 10a611 |
| Base 12 | 6a712 | a0712 |
| Base 13 | 5b313 | 87413 |
| Base 14 | 50b14 | 75514 |
| Base 15 | 46115 | 66715 |
| Base 16 | 3df16 | 5a716 |