Compare 19 vs 31

Unique factors11
Total factors11
Prime factorization191311
Prime factorization1931
Divisors count22
Divisors1, 191, 31
Number of properties1818
Centered decagonal primes 2nd
Centered triangular primes1st2nd
Chen primes8th11th
Class 1+ primes 8th
Cousin primes (1st member)4th 
Cuban primes 12nd 
Emirps 3rd
Euclid primes 4th
Happy primes3rd5th
Long primes3rd 
Lucky primes 4th
Mersenne primes 3rd
Multiplicative primes 7th
Pierpont primes7th 
Pierpont primes of the 2nd kind 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 
Right-truncatable primes 7th
Sexy primes (1st member) 7th
Sexy primes (2nd member)4th 
Sexy prime triplets (1st member) 5th
Sexy prime triplets (3rd member)2nd 
Solinas primes7th10th
Super primes 5th
Twin primes (2nd member)4th5th
Roman numberalsXIXXXXI
Base 2100112111112
Base 3201310113
Base 410341334
Base 53451115
Base 6316516
Base 7257437
Base 8238378
Base 9219349
Base 1019103110
Base 1118112911
Base 1217122712
Base 1316132513
Base 1415142314
Base 1514152115
Base 1613161f16
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