Compare 3 vs 9

Unique factors11
Total factors12
Prime factorization3132
Prime factorization33 × 3
Divisors count23
Divisors1, 31, 3, 9
Number of properties291
Additive primes2nd 
Chen primes2nd 
Class 1+ primes2nd 
Cousin primes (1st member)1st 
Cullen primes1st 
Euclid primes2nd 
Factorial primes2nd 
Fermat primes1st 
Fibonacci primes2nd 
Left-truncatable primes2nd 
Leyland primes1st 
Lucas primes2nd 
Lucky primes1st 
Mersenne primes1st 
Multiplicative primes2nd 
Palindromic primes2nd 
Pierpont primes2nd 
Pierpont primes of the 2nd kind2nd 
Proth primes1st 
Right-truncatable primes2nd 
Semiprimes 3rd
Solinas primes1st 
Sophie germain primes2nd 
Super primes1st 
Twin primes (1st member)1st 
Two-sided primes2nd 
Ulam primes2nd 
Wagstaff primes1st 
Wedderburn-etherington primes2nd 
Roman numberalsIIIIX
Base 211210012
Base 31031003
Base 434214
Base 535145
Base 636136
Base 737127
Base 838118
Base 939109
Base 10310910
Base 11311911
Base 12312912
Base 13313913
Base 14314914
Base 15315915
Base 16316916
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