Compare 161918 vs 161921
| Property | 161918 | 161921 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 21 × 191 × 42611 | 1619211 |
| Prime factorization | 2 × 19 × 4261 | 161921 |
| Divisors count | 8 | 2 |
| Divisors | 1, 2, 19, 38, 4261, 8522, 80959, 161918 | 1, 161921 |
| Number of properties | 0 | 5 |
| Chen primes | 6329th | |
| Harmonic primes | 5564th | |
| Primes | 14844th | |
| Pythagorean primes | 7400th | |
| Twin primes (1st member) | 1821st | |
| Roman numberals | ||
| Base 2 | 1001111000011111102 | 1001111000100000012 |
| Base 3 | 220200022223 | 220200100023 |
| Base 4 | 2132013324 | 2132020014 |
| Base 5 | 201401335 | 201401415 |
| Base 6 | 32453426 | 32453456 |
| Base 7 | 12430317 | 12430347 |
| Base 8 | 4741768 | 4742018 |
| Base 9 | 2660889 | 2661029 |
| Base 10 | 16191810 | 16192110 |
| Base 11 | 10071911 | 10072111 |
| Base 12 | 7985212 | 7985512 |
| Base 13 | 5891313 | 5891613 |
| Base 14 | 4301814 | 4301b14 |
| Base 15 | 32e9815 | 32e9b15 |
| Base 16 | 2787e16 | 2788116 |