31131400312 has 24 divisors (see below), whose sum is σ = 61019612640. Its totient is φ = 14888928560.

The previous prime is 31131400291. The next prime is 31131400337. The reversal of 31131400312 is 21300413113.

It is a self number, because there is not a number n which added to its sum of digits gives 31131400312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3673864 + ... + 3682327.

It is an arithmetic number, because the mean of its divisors is an integer number (2542483860).

Almost surely, 2^31131400312 is an apocalyptic number.

It is an amenable number.

31131400312 is a deficient number, since it is larger than the sum of its proper divisors (29888212328).

31131400312 is a wasteful number, since it uses less digits than its factorization.

31131400312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7356243 (or 7356216 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31131400312 its reverse (21300413113), we get a palindrome (52431813425).

The spelling of 31131400312 in words is "thirty-one billion, one hundred thirty-one million, four hundred thousand, three hundred twelve".