Compare 4 vs 19

Unique factors11
Total factors21
Prime factorization22191
Prime factorization2 × 219
Divisors count32
Divisors1, 2, 41, 19
Number of properties118
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 numberalsIVXIX
Base 21002100112
Base 31132013
Base 41041034
Base 545345
Base 646316
Base 747257
Base 848238
Base 949219
Base 104101910
Base 114111811
Base 124121712
Base 134131613
Base 144141514
Base 154151415
Base 164161316
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