Compare 991981 vs 991990
| Property | 991981 | 991990 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 5 |
| Total factors | 1 | 5 |
| Prime factorization | 9919811 | 21 × 51 × 191 × 231 × 2271 |
| Prime factorization | 991981 | 2 × 5 × 19 × 23 × 227 |
| Divisors count | 2 | 32 |
| Divisors | 1, 991981 | 1, 2, 5, 10, 19, 23, 38, 46, 95, 115, 190, 227, 230, 437, 454, 874, 1135, 2185, 2270, 4313, 4370, 5221, 8626, 10442, 21565, 26105, 43130, 52210, 99199, 198398, 495995, 991990 |
| Number of properties | 6 | 0 |
| Additive primes | 29905th | |
| Chen primes | 29751st | |
| Emirps | 10998th | |
| Primes | 77925th | |
| Sexy primes (1st member) | 16280th | |
| Twin primes (2nd member) | 8113th | |
| Roman numberals | ||
| Base 2 | 111100100010111011012 | 111100100010111101102 |
| Base 3 | 12121012020013 | 12121012021013 |
| Base 4 | 33020232314 | 33020233124 |
| Base 5 | 2232204115 | 2232204305 |
| Base 6 | 331323016 | 331323146 |
| Base 7 | 113010347 | 113010467 |
| Base 8 | 36213558 | 36213668 |
| Base 9 | 17716619 | 17716719 |
| Base 10 | 99198110 | 99199010 |
| Base 11 | 61832111 | 61832a11 |
| Base 12 | 3ba09112 | 3ba09a12 |
| Base 13 | 28969313 | 28969c13 |
| Base 14 | 1bb71b14 | 1bb72614 |
| Base 15 | 148dc115 | 148dca15 |
| Base 16 | f22ed16 | f22f616 |