Compare 9 vs 13

Property	9	13
Type	semiprime	prime
Unique factors	1	1
Total factors	2	1
Prime factorization	3²	13¹
Prime factorization	3 × 3	13
Divisors count	3	2
Divisors	1, 3, 9	1, 13
Number of properties	1	32
Centered square primes		2nd
Chen primes		6th
Cousin primes (1st member)		3rd
Cuban primes 2		1st
Emirps		1st
Fibonacci primes		4th
Happy primes		2nd
Harmonic primes		2nd
Left-truncatable primes		5th
Lucky primes		3rd
Multiplicative primes		5th
Pierpont primes		5th
Primes		6th
Prime quadruplets (2nd member)		2nd
Prime quadruplets (4th member)		1st
Prime quintuplet 1s (3rd member)		1st
Prime quintuplet 2s (2nd member)		2nd
Prime quintuplet 2s (4th member)		1st
Prime sextuplets (3rd member)		1st
Prime triplets (1st member)		4th
Prime triplets (2nd member)		3rd
Prime triplets (3rd member)		2nd
Proth primes		3rd
Pythagorean primes		2nd
Semiprimes	3rd
Sexy primes (1st member)		4th
Sexy primes (2nd member)		2nd
Sexy prime triplets (2nd member)		2nd
Solinas primes		5th
Thabit primes of the 2nd kind		2nd
Twin primes (2nd member)		3rd
Ulam primes		4th
Wilson primes		2nd
Roman numberals	IX	XIII
Base 2	1001₂	1101₂
Base 3	100₃	111₃
Base 4	21₄	31₄
Base 5	14₅	23₅
Base 6	13₆	21₆
Base 7	12₇	16₇
Base 8	11₈	15₈
Base 9	10₉	14₉
Base 10	9₁₀	13₁₀
Base 11	9₁₁	12₁₁
Base 12	9₁₂	11₁₂
Base 13	9₁₃	10₁₃
Base 14	9₁₄	d₁₄
Base 15	9₁₅	d₁₅
Base 16	9₁₆	d₁₆