Compare 23 vs 51

Property2351
Typeprimesemiprime
Unique factors12
Total factors12
Prime factorization23131 × 171
Prime factorization233 × 17
Divisors count24
Divisors1, 231, 3, 17, 51
Number of properties301
Additive primes6th 
Chen primes9th 
Class 1+ primes7th 
Cousin primes (2nd member)4th 
Factorial primes5th 
Happy primes4th 
Harmonic primes4th 
Isolated primes2nd 
Kynea primes3rd 
Left-truncatable primes7th 
Long primes4th 
Pierpont primes of the 2nd kind7th 
Primes9th 
Prime quintuplet 2s (5th member)2nd 
Prime sextuplets (6th member)1st 
Prime triplets (3rd member)5th 
Right-truncatable primes5th 
Safe primes4th 
Semiprimes 18th
Sexy primes (1st member)6th 
Sexy primes (2nd member)5th 
Sexy prime quadrupletss (4th member)1st 
Sexy prime quadrupletss (3rd member)2nd 
Sexy prime triplets (2nd member)4th 
Sexy prime triplets (3rd member)3rd 
Solinas primes8th 
Sophie germain primes5th 
Thabit primes4th 
Two-sided primes5th 
Wedderburn-etherington primes4th 
Woodall primes2nd 
Roman numberalsXXIIILI
Base 21011121100112
Base 3212312203
Base 411343034
Base 54352015
Base 63561236
Base 73271027
Base 8278638
Base 9259569
Base 1023105110
Base 1121114711
Base 121b124312
Base 131a133c13
Base 1419143914
Base 1518153615
Base 1617163316
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