31143004040 has 32 divisors (see below), whose sum is σ = 70077075480. Its totient is φ = 12456256512.

The previous prime is 31143004033. The next prime is 31143004043. The reversal of 31143004040 is 4040034113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13521503524 + 17621500516 = 116282^2 + 132746^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (31143004043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774512 + ... + 813728.

Almost surely, 2^31143004040 is an apocalyptic number.

It is an amenable number.

31143004040 is an abundant number, since it is smaller than the sum of its proper divisors (38934071440).

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

31143004040 is a wasteful number, since it uses less digits than its factorization.

31143004040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59081 (or 59077 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31143004040 its reverse (4040034113), we get a palindrome (35183038153).

The spelling of 31143004040 in words is "thirty-one billion, one hundred forty-three million, four thousand, forty".