31312012440 has 64 divisors (see below), whose sum is σ = 93949400160. Its totient is φ = 8348682240.

The previous prime is 31312012439. The next prime is 31312012447. The reversal of 31312012440 is 4421021313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312012447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1116672 + ... + 1144368.

Almost surely, 2^31312012440 is an apocalyptic number.

31312012440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31312012440 is an abundant number, since it is smaller than the sum of its proper divisors (62637387720).

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

31312012440 is a wasteful number, since it uses less digits than its factorization.

31312012440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37132 (or 37128 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31312012440 its reverse (4421021313), we get a palindrome (35733033753).

The spelling of 31312012440 in words is "thirty-one billion, three hundred twelve million, twelve thousand, four hundred forty".