Prime Numbers
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Numbers
Compare 19 vs 31
Compare 19 vs 31
Compare
vs
Compare
Property
19
31
Type
prime
prime
Unique factors
1
1
Total factors
1
1
Prime factorization
19
1
31
1
Prime factorization
19
31
Divisors count
2
2
Divisors
1
,
19
1
,
31
Number of properties
18
18
Centered decagonal primes
2nd
Centered triangular primes
1st
2nd
Chen primes
8th
11th
Class 1+ primes
8th
Cousin primes
(1st member)
4th
Cuban primes 1
2nd
Emirps
3rd
Euclid primes
4th
Happy primes
3rd
5th
Long primes
3rd
Lucky primes
4th
Mersenne primes
3rd
Multiplicative primes
7th
Pierpont primes
7th
Pierpont primes of the 2nd kind
8th
Primes
8th
11th
Prime quadruplets
(4th member)
2nd
Prime quintuplet 1s
(5th member)
1st
Prime quintuplet 2s
(4th member)
2nd
Prime sextuplets
(5th member)
1st
Prime triplets
(2nd member)
5th
Prime triplets
(3rd member)
4th
Right-truncatable primes
7th
Sexy primes
(1st member)
7th
Sexy primes
(2nd member)
4th
Sexy prime triplets
(1st member)
5th
Sexy prime triplets
(3rd member)
2nd
Solinas primes
7th
10th
Super primes
5th
Twin primes
(2nd member)
4th
5th
Roman numberals
XIX
XXXI
Base 2
10011
2
11111
2
Base 3
201
3
1011
3
Base 4
103
4
133
4
Base 5
34
5
111
5
Base 6
31
6
51
6
Base 7
25
7
43
7
Base 8
23
8
37
8
Base 9
21
9
34
9
Base 10
19
10
31
10
Base 11
18
11
29
11
Base 12
17
12
27
12
Base 13
16
13
25
13
Base 14
15
14
23
14
Base 15
14
15
21
15
Base 16
13
16
1f
16
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