Compare 18 vs 19

Typecomposite numberprime
Unique factors21
Total factors31
Prime factorization21 × 32191
Prime factorization2 × 3 × 319
Divisors count62
Divisors1, 2, 3, 6, 9, 181, 19
Number of properties018
Centered triangular primes 1st
Chen primes 8th
Cousin primes (1st member) 4th
Cuban primes 1 2nd
Happy primes 3rd
Long primes 3rd
Pierpont primes 7th
Primes 8th
Prime quadruplets (4th member) 2nd
Prime quintuplet 1s (5th member) 1st
Prime quintuplet 2s (4th member) 2nd
Prime sextuplets (5th member) 1st
Prime triplets (2nd member) 5th
Prime triplets (3rd member) 4th
Sexy primes (2nd member) 4th
Sexy prime triplets (3rd member) 2nd
Solinas primes 7th
Twin primes (2nd member) 4th
Roman numberalsXVIIIXIX
Base 2100102100112
Base 320032013
Base 410241034
Base 5335345
Base 6306316
Base 7247257
Base 8228238
Base 9209219
Base 1018101910
Base 1117111811
Base 1216121712
Base 1315131613
Base 1414141514
Base 1513151415
Base 1612161316
This website uses cookies to ensure you get the best experience on our website. More info