31138919724 has 36 divisors (see below), whose sum is σ = 79863183512. Its totient is φ = 9436035840.

The previous prime is 31138919723. The next prime is 31138919753. The reversal of 31138919724 is 42791983113.

It is not an unprimeable number, because it can be changed into a prime (31138919723) 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 11 ways as a sum of consecutive naturals, for example, 10721317 + ... + 10724220.

Almost surely, 2^31138919724 is an apocalyptic number.

It is an amenable number.

31138919724 is an abundant number, since it is smaller than the sum of its proper divisors (48724263788).

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

31138919724 is a wasteful number, since it uses less digits than its factorization.

31138919724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21445566 (or 21445553 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The spelling of 31138919724 in words is "thirty-one billion, one hundred thirty-eight million, nine hundred nineteen thousand, seven hundred twenty-four".