Compare 489 vs 491
| Property | 489 | 491 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 31 × 1631 | 4911 |
| Prime factorization | 3 × 163 | 491 |
| Divisors count | 4 | 2 |
| Divisors | 1, 3, 163, 489 | 1, 491 |
| Number of properties | 1 | 7 |
| Chen primes | 66th | |
| Cousin primes (2nd member) | 26th | |
| Harmonic primes | 38th | |
| Isolated primes | 47th | |
| Long primes | 34th | |
| Primes | 94th | |
| Semiprimes | 151st | |
| Sophie germain primes | 25th | |
| Roman numberals | CDLXXXIX | CDXCI |
| Base 2 | 1111010012 | 1111010112 |
| Base 3 | 2000103 | 2000123 |
| Base 4 | 132214 | 132234 |
| Base 5 | 34245 | 34315 |
| Base 6 | 21336 | 21356 |
| Base 7 | 12667 | 13017 |
| Base 8 | 7518 | 7538 |
| Base 9 | 6039 | 6059 |
| Base 10 | 48910 | 49110 |
| Base 11 | 40511 | 40711 |
| Base 12 | 34912 | 34b12 |
| Base 13 | 2b813 | 2ba13 |
| Base 14 | 26d14 | 27114 |
| Base 15 | 22915 | 22b15 |
| Base 16 | 1e916 | 1eb16 |