Compare 28181 vs 28191
| Property | 28181 | 28191 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 281811 | 31 × 93971 |
| Prime factorization | 28181 | 3 × 9397 |
| Divisors count | 2 | 4 |
| Divisors | 1, 28181 | 1, 3, 9397, 28191 |
| Number of properties | 5 | 1 |
| Chen primes | 1493rd | |
| Harmonic primes | 1147th | |
| Primes | 3072nd | |
| Pythagorean primes | 1529th | |
| Semiprimes | 7030th | |
| Twin primes (1st member) | 449th | |
| Roman numberals | ||
| Base 2 | 1101110000101012 | 1101110000111112 |
| Base 3 | 11021222023 | 11022000103 |
| Base 4 | 123201114 | 123201334 |
| Base 5 | 14002115 | 14002315 |
| Base 6 | 3342456 | 3343036 |
| Base 7 | 1451067 | 1451227 |
| Base 8 | 670258 | 670378 |
| Base 9 | 425829 | 426039 |
| Base 10 | 2818110 | 2819110 |
| Base 11 | 1a19a11 | 1a1a911 |
| Base 12 | 1438512 | 1439312 |
| Base 13 | ca9a13 | caa713 |
| Base 14 | a3ad14 | a3b914 |
| Base 15 | 853b15 | 854615 |
| Base 16 | 6e1516 | 6e1f16 |