31513500040 has 32 divisors (see below), whose sum is σ = 77351319360. Its totient is φ = 11459454400.

The previous prime is 31513500037. The next prime is 31513500061. The reversal of 31513500040 is 4000531513.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31513499984 and 31513500020.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35810356 + ... + 35811235.

It is an arithmetic number, because the mean of its divisors is an integer number (2417228730).

Almost surely, 2^31513500040 is an apocalyptic number.

It is an amenable number.

31513500040 is an abundant number, since it is smaller than the sum of its proper divisors (45837819320).

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

31513500040 is a wasteful number, since it uses less digits than its factorization.

31513500040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71621613 (or 71621609 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The spelling of 31513500040 in words is "thirty-one billion, five hundred thirteen million, five hundred thousand, forty".