Prime Numbers
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Numbers
Compare 13 vs 31
Compare 13 vs 31
Compare
vs
Compare
Property
13
31
Type
prime
prime
Unique factors
1
1
Total factors
1
1
Prime factorization
13
^{1}
31
^{1}
Prime factorization
13
31
Divisors count
2
2
Divisors
1
,
13
1
,
31
Number of properties
32
18
Centered decagonal primes
2nd
Centered square primes
2nd
Centered triangular primes
2nd
Chen primes
6th
11th
Class 1+ primes
8th
Cousin primes
(1st member)
3rd
Cuban primes 2
1st
Emirps
1st
3rd
Euclid primes
4th
Fibonacci primes
4th
Happy primes
2nd
5th
Harmonic primes
2nd
Left-truncatable primes
5th
Lucky primes
3rd
4th
Mersenne primes
3rd
Multiplicative primes
5th
7th
Pierpont primes
5th
Pierpont primes of the 2nd kind
8th
Primes
6th
11th
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
Right-truncatable primes
7th
Sexy primes
(1st member)
4th
7th
Sexy primes
(2nd member)
2nd
Sexy prime triplets
(1st member)
5th
Sexy prime triplets
(2nd member)
2nd
Solinas primes
5th
10th
Super primes
5th
Thabit primes of the 2nd kind
2nd
Twin primes
(2nd member)
3rd
5th
Ulam primes
4th
Wilson primes
2nd
Roman numberals
XIII
XXXI
Base 2
1101
_{2}
11111
_{2}
Base 3
111
_{3}
1011
_{3}
Base 4
31
_{4}
133
_{4}
Base 5
23
_{5}
111
_{5}
Base 6
21
_{6}
51
_{6}
Base 7
16
_{7}
43
_{7}
Base 8
15
_{8}
37
_{8}
Base 9
14
_{9}
34
_{9}
Base 10
13
_{10}
31
_{10}
Base 11
12
_{11}
29
_{11}
Base 12
11
_{12}
27
_{12}
Base 13
10
_{13}
25
_{13}
Base 14
d
_{14}
23
_{14}
Base 15
d
_{15}
21
_{15}
Base 16
d
_{16}
1f
_{16}
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