Compare 5 vs 15

Unique factors12
Total factors12
Prime factorization5131 × 51
Prime factorization53 × 5
Divisors count24
Divisors1, 51, 3, 5, 15
Number of properties361
Additive primes3rd 
Bell primes2nd 
Centered square primes1st 
Chen primes3rd 
Class 1+ primes3rd 
Dihedral primes2nd 
Factorial primes3rd 
Fermat primes2nd 
Fibonacci primes3rd 
Good primes1st 
Harmonic primes1st 
Left-truncatable primes3rd 
Multiplicative primes3rd 
Palindromic primes3rd 
Pierpont primes3rd 
Pierpont primes of the 2nd kind3rd 
Prime quadruplets (1st member)1st 
Prime quintuplet 2s (1st member)1st 
Prime triplets (1st member)1st 
Proth primes2nd 
Pythagorean primes1st 
Restricted left-truncatable primes2nd 
Right-truncatable primes3rd 
Safe primes1st 
Semiprimes 6th
Sexy primes (1st member)1st 
Sexy prime quadrupletss (1st member)1st 
Sexy prime triplets (1st member)1st 
Solinas primes2nd 
Sophie germain primes3rd 
Super primes2nd 
Thabit primes2nd 
Twin primes (1st member)2nd 
Twin primes (2nd member)1st 
Two-sided primes3rd 
Wilson primes1st 
Roman numberalsVXV
Base 2101211112
Base 31231203
Base 4114334
Base 5105305
Base 656236
Base 757217
Base 858178
Base 959169
Base 105101510
Base 115111411
Base 125121312
Base 135131213
Base 145141114
Base 155151015
Base 16516f16
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