31311520140 has 48 divisors (see below), whose sum is σ = 87685994592. Its totient is φ = 8348430336.

The previous prime is 31311520087. The next prime is 31311520199. The reversal of 31311520140 is 4102511313.

It is a super-2 number, since 2×31311520140² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381222 + ... + 456018.

It is an arithmetic number, because the mean of its divisors is an integer number (1826791554).

Almost surely, 2^31311520140 is an apocalyptic number.

31311520140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31311520140 is an abundant number, since it is smaller than the sum of its proper divisors (56374474452).

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

31311520140 is a wasteful number, since it uses less digits than its factorization.

31311520140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81786 (or 81784 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The spelling of 31311520140 in words is "thirty-one billion, three hundred eleven million, five hundred twenty thousand, one hundred forty".