Prime Numbers
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Numbers
Compare 7 vs 9
Compare 7 vs 9
Compare
vs
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Property
7
9
Type
prime
semiprime
Unique factors
1
1
Total factors
1
2
Prime factorization
7
^{1}
3
^{2}
Prime factorization
7
3
×
3
Divisors count
2
3
Divisors
1
,
7
1
,
3
,
9
Number of properties
37
1
Additive primes
4th
Carol primes
1st
Chen primes
4th
Class 1+ primes
4th
Cousin primes
(1st member)
2nd
Cousin primes
(2nd member)
1st
Cuban primes 1
1st
Double mersenne primes
1st
Euclid primes
3rd
Factorial primes
4th
Happy primes
1st
Kynea primes
2nd
Left-truncatable primes
4th
Long primes
1st
Lucas primes
3rd
Lucky primes
2nd
Mersenne primes
2nd
Multiplicative primes
4th
Palindromic primes
4th
Pierpont primes
4th
Pierpont primes of the 2nd kind
4th
Primes
4th
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 primes
4th
Safe primes
2nd
Semiprimes
3rd
Sexy primes
(1st member)
2nd
Sexy prime triplets
(1st member)
2nd
Solinas primes
3rd
Thabit primes of the 2nd kind
1st
Twin primes
(2nd member)
2nd
Two-sided primes
4th
Woodall primes
1st
Roman numberals
VII
IX
Base 2
111
_{2}
1001
_{2}
Base 3
21
_{3}
100
_{3}
Base 4
13
_{4}
21
_{4}
Base 5
12
_{5}
14
_{5}
Base 6
11
_{6}
13
_{6}
Base 7
10
_{7}
12
_{7}
Base 8
7
_{8}
11
_{8}
Base 9
7
_{9}
10
_{9}
Base 10
7
_{10}
9
_{10}
Base 11
7
_{11}
9
_{11}
Base 12
7
_{12}
9
_{12}
Base 13
7
_{13}
9
_{13}
Base 14
7
_{14}
9
_{14}
Base 15
7
_{15}
9
_{15}
Base 16
7
_{16}
9
_{16}
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