Compare 9 vs 11

Property	9	11
Type	semiprime	prime
Unique factors	1	1
Total factors	2	1
Prime factorization	3²	11¹
Prime factorization	3 × 3	11
Divisors count	3	2
Divisors	1, 3, 9	1, 11
Number of properties	1	36
Additive primes		5th
Centered decagonal primes		1st
Chen primes		5th
Class 1+ primes		5th
Cousin primes (2nd member)		2nd
Dihedral primes		3rd
Good primes		2nd
Lucas primes		4th
Mills primes		2nd
Palindromic primes		5th
Pierpont primes of the 2nd kind		5th
Primes		5th
Prime quadruplets (1st member)		2nd
Prime quadruplets (3rd member)		1st
Prime quintuplet 1s (2nd member)		1st
Prime quintuplet 2s (1st member)		2nd
Prime quintuplet 2s (3rd member)		1st
Prime sextuplets (2nd member)		1st
Prime triplets (1st member)		3rd
Prime triplets (2nd member)		2nd
Prime triplets (3rd member)		1st
Safe primes		3rd
Semiprimes	3rd
Sexy primes (1st member)		3rd
Sexy primes (2nd member)		1st
Sexy prime quadrupletss (1st member)		2nd
Sexy prime quadrupletss (2nd member)		1st
Sexy prime triplets (1st member)		3rd
Sexy prime triplets (2nd member)		1st
Solinas primes		4th
Sophie germain primes		4th
Super primes		3rd
Thabit primes		3rd
Twin primes (1st member)		3rd
Ulam primes		3rd
Wagstaff primes		2nd
Wedderburn-etherington primes		3rd
Roman numberals	IX	XI
Base 2	1001₂	1011₂
Base 3	100₃	102₃
Base 4	21₄	23₄
Base 5	14₅	21₅
Base 6	13₆	15₆
Base 7	12₇	14₇
Base 8	11₈	13₈
Base 9	10₉	12₉
Base 10	9₁₀	11₁₀
Base 11	9₁₁	10₁₁
Base 12	9₁₂	b₁₂
Base 13	9₁₃	b₁₃
Base 14	9₁₄	b₁₄
Base 15	9₁₅	b₁₅
Base 16	9₁₆	b₁₆