31531631892 has 24 divisors (see below), whose sum is σ = 77901679296. Its totient is φ = 9892276608.

The previous prime is 31531631839. The next prime is 31531631893. The reversal of 31531631892 is 29813613513.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31531631893) 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, 77283208 + ... + 77283615.

It is an arithmetic number, because the mean of its divisors is an integer number (3245903304).

Almost surely, 2^31531631892 is an apocalyptic number.

It is an amenable number.

31531631892 is an abundant number, since it is smaller than the sum of its proper divisors (46370047404).

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

31531631892 is a wasteful number, since it uses less digits than its factorization.

31531631892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154566847 (or 154566845 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The spelling of 31531631892 in words is "thirty-one billion, five hundred thirty-one million, six hundred thirty-one thousand, eight hundred ninety-two".