Compare 19891 vs 19901
| Property | 19891 | 19901 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 198911 | 71 × 28431 |
| Prime factorization | 19891 | 7 × 2843 |
| Divisors count | 2 | 4 |
| Divisors | 1, 19891 | 1, 7, 2843, 19901 |
| Number of properties | 4 | 1 |
| Harmonic primes | 815th | |
| Palindromic primes | 45th | |
| Primes | 2250th | |
| Semiprimes | 5062nd | |
| Twin primes (2nd member) | 340th | |
| Roman numberals | ||
| Base 2 | 1001101101100112 | 1001101101111012 |
| Base 3 | 10000212013 | 10000220023 |
| Base 4 | 103123034 | 103123314 |
| Base 5 | 11140315 | 11141015 |
| Base 6 | 2320316 | 2320456 |
| Base 7 | 1116647 | 1120107 |
| Base 8 | 466638 | 466758 |
| Base 9 | 302519 | 302629 |
| Base 10 | 1989110 | 1990110 |
| Base 11 | 13a4311 | 13a5211 |
| Base 12 | b61712 | b62512 |
| Base 13 | 909113 | 909b13 |
| Base 14 | 736b14 | 737714 |
| Base 15 | 5d6115 | 5d6b15 |
| Base 16 | 4db316 | 4dbd16 |