Compare 997 vs 1021
| Property | 997 | 1021 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 9971 | 10211 |
| Prime factorization | 997 | 1021 |
| Divisors count | 2 | 2 |
| Divisors | 1, 997 | 1, 1021 |
| Number of properties | 6 | 8 |
| Emirps | 38th | |
| Harmonic primes | 61st | |
| Isolated primes | 99th | |
| Left-truncatable primes | 54th | |
| Long primes | 62nd | |
| Lucky primes | 43rd | 45th |
| Primes | 168th | 172nd |
| Pythagorean primes | 80th | 83rd |
| Sexy primes (2nd member) | 74th | |
| Solinas primes | 46th | |
| Twin primes (2nd member) | 36th | |
| Roman numberals | CMXCVII | MXXI |
| Base 2 | 11111001012 | 11111111012 |
| Base 3 | 11002213 | 11012113 |
| Base 4 | 332114 | 333314 |
| Base 5 | 124425 | 130415 |
| Base 6 | 43416 | 44216 |
| Base 7 | 26237 | 26567 |
| Base 8 | 17458 | 17758 |
| Base 9 | 13279 | 13549 |
| Base 10 | 99710 | 102110 |
| Base 11 | 82711 | 84911 |
| Base 12 | 6b112 | 71112 |
| Base 13 | 5b913 | 60713 |
| Base 14 | 51314 | 52d14 |
| Base 15 | 46715 | 48115 |
| Base 16 | 3e516 | 3fd16 |