31302131013 has 6 divisors (see below), whose sum is σ = 45214189254. Its totient is φ = 20868087336.

The previous prime is 31302131011. The next prime is 31302131033. The reversal of 31302131013 is 31013120313.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21909032289 + 9393098724 = 148017^2 + 96918^2 .

It is not a de Polignac number, because 31302131013 - 2¹ = 31302131011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31302131011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1739007270 + ... + 1739007287.

It is an arithmetic number, because the mean of its divisors is an integer number (7535698209).

Almost surely, 2^31302131013 is an apocalyptic number.

It is an amenable number.

31302131013 is a deficient number, since it is larger than the sum of its proper divisors (13912058241).

31302131013 is a wasteful number, since it uses less digits than its factorization.

31302131013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3478014563 (or 3478014560 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31302131013 its reverse (31013120313), we get a palindrome (62315251326).

The spelling of 31302131013 in words is "thirty-one billion, three hundred two million, one hundred thirty-one thousand, thirteen".