Prime Numbers
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Numbers
Compare 2 vs 31
Compare 2 vs 31
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vs
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Property
2
31
Type
prime
prime
Unique factors
1
1
Total factors
1
1
Prime factorization
2
^{1}
31
^{1}
Prime factorization
2
31
Divisors count
2
2
Divisors
1
,
2
1
,
31
Number of properties
26
18
Additive primes
1st
Bell primes
1st
Centered decagonal primes
2nd
Centered triangular primes
2nd
Chen primes
1st
11th
Class 1+ primes
1st
8th
Dihedral primes
1st
Emirps
3rd
Euclid primes
1st
4th
Factorial primes
1st
Fibonacci primes
1st
Happy primes
5th
Isolated primes
1st
Kynea primes
1st
Left-truncatable primes
1st
Lucas primes
1st
Lucky primes
4th
Mersenne primes
3rd
Mills primes
1st
Multiplicative primes
1st
7th
Palindromic primes
1st
Pierpont primes
1st
Pierpont primes of the 2nd kind
1st
8th
Primes
1st
11th
Quartan primes
1st
Restricted left-truncatable primes
1st
Right-truncatable primes
1st
7th
Sexy primes
(1st member)
7th
Sexy prime triplets
(1st member)
5th
Solinas primes
10th
Sophie germain primes
1st
Super primes
5th
Thabit primes
1st
Twin primes
(2nd member)
5th
Two-sided primes
1st
Ulam primes
1st
Wedderburn-etherington primes
1st
Roman numberals
II
XXXI
Base 2
10
_{2}
11111
_{2}
Base 3
2
_{3}
1011
_{3}
Base 4
2
_{4}
133
_{4}
Base 5
2
_{5}
111
_{5}
Base 6
2
_{6}
51
_{6}
Base 7
2
_{7}
43
_{7}
Base 8
2
_{8}
37
_{8}
Base 9
2
_{9}
34
_{9}
Base 10
2
_{10}
31
_{10}
Base 11
2
_{11}
29
_{11}
Base 12
2
_{12}
27
_{12}
Base 13
2
_{13}
25
_{13}
Base 14
2
_{14}
23
_{14}
Base 15
2
_{15}
21
_{15}
Base 16
2
_{16}
1f
_{16}
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