31313146516 has 12 divisors (see below), whose sum is σ = 54799656660. Its totient is φ = 15656101760.

The previous prime is 31313146511. The next prime is 31313146537. The reversal of 31313146516 is 61564131313.

It can be written as a sum of positive squares in 2 ways, for example, as 14872778116 + 16440368400 = 121954^2 + 128220^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313146511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62076 + ... + 257836.

It is an arithmetic number, because the mean of its divisors is an integer number (4566638055).

Almost surely, 2^31313146516 is an apocalyptic number.

It is an amenable number.

31313146516 is a deficient number, since it is larger than the sum of its proper divisors (23486510144).

31313146516 is a wasteful number, since it uses less digits than its factorization.

31313146516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235754 (or 235752 counting only the distinct ones).

The product of its digits is 19440, while the sum is 34.

Adding to 31313146516 its reverse (61564131313), we get a palindrome (92877277829).

The spelling of 31313146516 in words is "thirty-one billion, three hundred thirteen million, one hundred forty-six thousand, five hundred sixteen".