31213313104 has 20 divisors (see below), whose sum is σ = 61074567540. Its totient is φ = 15452134400.

The previous prime is 31213313057. The next prime is 31213313119. The reversal of 31213313104 is 40131331213.

It can be written as a sum of positive squares in 2 ways, for example, as 14893761600 + 16319551504 = 122040^2 + 127748^2 .

It is a super-2 number, since 2×31213313104² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9655969 + ... + 9659200.

It is an arithmetic number, because the mean of its divisors is an integer number (3053728377).

Almost surely, 2^31213313104 is an apocalyptic number.

It is an amenable number.

31213313104 is a deficient number, since it is larger than the sum of its proper divisors (29861254436).

31213313104 is a wasteful number, since it uses less digits than its factorization.

31213313104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19315278 (or 19315272 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31213313104 its reverse (40131331213), we get a palindrome (71344644317).

The spelling of 31213313104 in words is "thirty-one billion, two hundred thirteen million, three hundred thirteen thousand, one hundred four".