Compare 19 vs 28

Typeprimecomposite number
Unique factors12
Total factors13
Prime factorization19122 × 71
Prime factorization192 × 2 × 7
Divisors count26
Divisors1, 191, 2, 4, 7, 14, 28
Number of properties180
Centered triangular primes1st 
Chen primes8th 
Cousin primes (1st member)4th 
Cuban primes 12nd 
Happy primes3rd 
Long primes3rd 
Pierpont primes7th 
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 primes7th 
Twin primes (2nd member)4th 
Roman numberalsXIXXXVIII
Base 2100112111002
Base 3201310013
Base 410341304
Base 53451035
Base 6316446
Base 7257407
Base 8238348
Base 9219319
Base 1019102810
Base 1118112611
Base 1217122412
Base 1316132213
Base 1415142014
Base 1514151d15
Base 1613161c16
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