Compare 991 vs 1409
| Property | 991 | 1409 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 9911 | 14091 |
| Prime factorization | 991 | 1409 |
| Divisors count | 2 | 2 |
| Divisors | 1, 991 | 1, 1409 |
| Number of properties | 10 | 8 |
| Additive primes | 89th | |
| Chen primes | 115th | 146th |
| Emirps | 36th | 66th |
| Isolated primes | 98th | 132nd |
| Lucky primes | 42nd | |
| Primes | 167th | 223rd |
| Proth primes | 20th | |
| Pythagorean primes | 110th | |
| Sexy primes (1st member) | 74th | |
| Solinas primes | 43rd | |
| Sophie germain primes | 46th | |
| Super primes | 39th | 48th |
| Ulam primes | 18th | |
| Roman numberals | CMXCI | MCDIX |
| Base 2 | 11110111112 | 101100000012 |
| Base 3 | 11002013 | 12210123 |
| Base 4 | 331334 | 1120014 |
| Base 5 | 124315 | 211145 |
| Base 6 | 43316 | 103056 |
| Base 7 | 26147 | 40527 |
| Base 8 | 17378 | 26018 |
| Base 9 | 13219 | 18359 |
| Base 10 | 99110 | 140910 |
| Base 11 | 82111 | 107111 |
| Base 12 | 6a712 | 99512 |
| Base 13 | 5b313 | 84513 |
| Base 14 | 50b14 | 72914 |
| Base 15 | 46115 | 63e15 |
| Base 16 | 3df16 | 58116 |