31311020013 has 16 divisors (see below), whose sum is σ = 51382187136. Its totient is φ = 16515702720.

The previous prime is 31311020011. The next prime is 31311020017. The reversal of 31311020013 is 31002011313.

It is not a de Polignac number, because 31311020013 - 2¹ = 31311020011 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31311019974 and 31311020001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311020011) 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, 57345918 + ... + 57346463.

It is an arithmetic number, because the mean of its divisors is an integer number (3211386696).

Almost surely, 2^31311020013 is an apocalyptic number.

It is an amenable number.

31311020013 is a deficient number, since it is larger than the sum of its proper divisors (20071167123).

31311020013 is a wasteful number, since it uses less digits than its factorization.

31311020013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114692404.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 31311020013 its reverse (31002011313), we get a palindrome (62313031326).

The spelling of 31311020013 in words is "thirty-one billion, three hundred eleven million, twenty thousand, thirteen".