Compare 19981 vs 19991
| Property | 19981 | 19991 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 131 × 291 × 531 | 199911 |
| Prime factorization | 13 × 29 × 53 | 19991 |
| Divisors count | 8 | 2 |
| Divisors | 1, 13, 29, 53, 377, 689, 1537, 19981 | 1, 19991 |
| Number of properties | 0 | 9 |
| Additive primes | 1049th | |
| Chen primes | 1111th | |
| Harmonic primes | 820th | |
| Palindromic primes | 46th | |
| Primes | 2260th | |
| Prime triplets (1st member) | 168th | |
| Sexy primes (1st member) | 693rd | |
| Sophie germain primes | 326th | |
| Twin primes (1st member) | 342nd | |
| Roman numberals | ||
| Base 2 | 1001110000011012 | 1001110000101112 |
| Base 3 | 10001020013 | 10001021023 |
| Base 4 | 103200314 | 103201134 |
| Base 5 | 11144115 | 11144315 |
| Base 6 | 2323016 | 2323156 |
| Base 7 | 1121537 | 1121667 |
| Base 8 | 470158 | 470278 |
| Base 9 | 303619 | 303729 |
| Base 10 | 1998110 | 1999110 |
| Base 11 | 1401511 | 1402411 |
| Base 12 | b69112 | b69b12 |
| Base 13 | 913013 | 913a13 |
| Base 14 | 73d314 | 73dd14 |
| Base 15 | 5dc115 | 5dcb15 |
| Base 16 | 4e0d16 | 4e1716 |