Compare 7 vs 51

Property751
Typeprimesemiprime
Unique factors12
Total factors12
Prime factorization7131 × 171
Prime factorization73 × 17
Divisors count24
Divisors1, 71, 3, 17, 51
Number of properties371
Additive primes4th 
Carol primes1st 
Chen primes4th 
Class 1+ primes4th 
Cousin primes (2nd member)1st 
Cousin primes (1st member)2nd 
Cuban primes 11st 
Double mersenne primes1st 
Euclid primes3rd 
Factorial primes4th 
Happy primes1st 
Kynea primes2nd 
Left-truncatable primes4th 
Long primes1st 
Lucas primes3rd 
Lucky primes2nd 
Mersenne primes2nd 
Multiplicative primes4th 
Palindromic primes4th 
Pierpont primes4th 
Pierpont primes of the 2nd kind4th 
Primes4th 
Prime quadruplets (2nd member)1st 
Prime quintuplet 1s (1st member)1st 
Prime quintuplet 2s (2nd member)1st 
Prime sextuplets (1st member)1st 
Prime triplets (1st member)2nd 
Prime triplets (2nd member)1st 
Right-truncatable primes4th 
Safe primes2nd 
Semiprimes 18th
Sexy primes (1st member)2nd 
Sexy prime triplets (1st member)2nd 
Solinas primes3rd 
Thabit primes of the 2nd kind1st 
Twin primes (2nd member)2nd 
Two-sided primes4th 
Woodall primes1st 
Roman numberalsVIILI
Base 211121100112
Base 321312203
Base 41343034
Base 51252015
Base 61161236
Base 71071027
Base 878638
Base 979569
Base 107105110
Base 117114711
Base 127124312
Base 137133c13
Base 147143914
Base 157153615
Base 167163316
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