31231311313 has 16 divisors (see below), whose sum is σ = 33001758720. Its totient is φ = 29473711056.

The previous prime is 31231311283. The next prime is 31231311403. The reversal of 31231311313 is 31311313213.

It is a cyclic number.

It is not a de Polignac number, because 31231311313 - 2²⁵ = 31197756881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31231311413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10329720 + ... + 10332742.

It is an arithmetic number, because the mean of its divisors is an integer number (2062609920).

Almost surely, 2^31231311313 is an apocalyptic number.

It is an amenable number.

31231311313 is a deficient number, since it is larger than the sum of its proper divisors (1770447407).

31231311313 is a wasteful number, since it uses less digits than its factorization.

31231311313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4956.

The product of its digits is 486, while the sum is 22.

Adding to 31231311313 its reverse (31311313213), we get a palindrome (62542624526).

The spelling of 31231311313 in words is "thirty-one billion, two hundred thirty-one million, three hundred eleven thousand, three hundred thirteen".