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311231113 is a prime number
BaseRepresentation
bin10010100011010…
…000001010001001
3210200122011211021
4102203100022021
51114133343423
650514432441
710466264224
oct2243201211
9720564737
10311231113
1114a7555a6
1288292721
134c630b2b
142d4985bb
151c4cb95d
hex128d0289

311231113 has 2 divisors, whose sum is σ = 311231114. Its totient is φ = 311231112.

The previous prime is 311231111. The next prime is 311231143. The reversal of 311231113 is 311132113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 291623929 + 19607184 = 17077^2 + 4428^2 .

It is a cyclic number.

It is not a de Polignac number, because 311231113 - 21 = 311231111 is a prime.

Together with 311231111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (311231111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155615556 + 155615557.

It is an arithmetic number, because the mean of its divisors is an integer number (155615557).

Almost surely, 2311231113 is an apocalyptic number.

It is an amenable number.

311231113 is a deficient number, since it is larger than the sum of its proper divisors (1).

311231113 is an equidigital number, since it uses as much as digits as its factorization.

311231113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 16.

The square root of 311231113 is about 17641.7434795997. The cubic root of 311231113 is about 677.6846810699.

Adding to 311231113 its reverse (311132113), we get a palindrome (622363226).

It can be divided in two parts, 3112 and 31113, that added together give a square (34225 = 1852).

The spelling of 311231113 in words is "three hundred eleven million, two hundred thirty-one thousand, one hundred thirteen".