31187140808 has 32 divisors (see below), whose sum is σ = 58624181760. Its totient is φ = 15554073600.

The previous prime is 31187140801. The next prime is 31187140841. The reversal of 31187140808 is 80804178113.

It is not an unprimeable number, because it can be changed into a prime (31187140801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9004085 + ... + 9007547.

It is an arithmetic number, because the mean of its divisors is an integer number (1832005680).

Almost surely, 2^31187140808 is an apocalyptic number.

It is an amenable number.

31187140808 is a deficient number, since it is larger than the sum of its proper divisors (27437040952).

31187140808 is a wasteful number, since it uses less digits than its factorization.

31187140808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5997 (or 5993 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 41.

The spelling of 31187140808 in words is "thirty-one billion, one hundred eighty-seven million, one hundred forty thousand, eight hundred eight".