31312191940 has 48 divisors (see below), whose sum is σ = 66757017600. Its totient is φ = 12334937472.

The previous prime is 31312191901. The next prime is 31312191949. The reversal of 31312191940 is 4919121313.

It is a junction number, because it is equal to n+sod(n) for n = 31312191896 and 31312191905.

It is not an unprimeable number, because it can be changed into a prime (31312191949) 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, 602301 + ... + 652219.

It is an arithmetic number, because the mean of its divisors is an integer number (1390771200).

Almost surely, 2^31312191940 is an apocalyptic number.

It is an amenable number.

31312191940 is an abundant number, since it is smaller than the sum of its proper divisors (35444825660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31312191940 is a wasteful number, since it uses less digits than its factorization.

31312191940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50404 (or 50402 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The spelling of 31312191940 in words is "thirty-one billion, three hundred twelve million, one hundred ninety-one thousand, nine hundred forty".