31311011132013 has 4 divisors (see below), whose sum is σ = 41748014842688. Its totient is φ = 20874007421340.

The previous prime is 31311011132003. The next prime is 31311011132081. The reversal of 31311011132013 is 31023111011313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-31311011132013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311011132003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5218501855333 + ... + 5218501855338.

It is an arithmetic number, because the mean of its divisors is an integer number (10437003710672).

Almost surely, 2^{31311011132013} is an apocalyptic number.

It is an amenable number.

31311011132013 is a deficient number, since it is larger than the sum of its proper divisors (10437003710675).

31311011132013 is a wasteful number, since it uses less digits than its factorization.

31311011132013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10437003710674.

The product of its (nonzero) digits is 162, while the sum is 21.

Adding to 31311011132013 its reverse (31023111011313), we get a palindrome (62334122143326).

The spelling of 31311011132013 in words is "thirty-one trillion, three hundred eleven billion, eleven million, one hundred thirty-two thousand, thirteen".