31311023113313 has 4 divisors (see below), whose sum is σ = 31311664558020. Its totient is φ = 31310381668608.

The previous prime is 31311023113259. The next prime is 31311023113333. The reversal of 31311023113313 is 31331132011313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19781786219584 + 11529236893729 = 4447672^2 + 3395473^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311023113313 - 2¹² = 31311023109217 is a prime.

It is a super-2 number, since 2×31311023113313² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311023113333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320649128 + ... + 320746761.

It is an arithmetic number, because the mean of its divisors is an integer number (7827916139505).

Almost surely, 2^{31311023113313} is an apocalyptic number.

It is an amenable number.

31311023113313 is a deficient number, since it is larger than the sum of its proper divisors (641444707).

31311023113313 is an equidigital number, since it uses as much as digits as its factorization.

31311023113313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641444706.

The product of its (nonzero) digits is 1458, while the sum is 26.

Adding to 31311023113313 its reverse (31331132011313), we get a palindrome (62642155124626).

The spelling of 31311023113313 in words is "thirty-one trillion, three hundred eleven billion, twenty-three million, one hundred thirteen thousand, three hundred thirteen".