31371138436 has 24 divisors (see below), whose sum is σ = 60257794464. Its totient is φ = 14172122880.

The previous prime is 31371138427. The next prime is 31371138439. The reversal of 31371138436 is 63483117313.

It is not an unprimeable number, because it can be changed into a prime (31371138439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2179885 + ... + 2194228.

It is an arithmetic number, because the mean of its divisors is an integer number (2510741436).

Almost surely, 2^31371138436 is an apocalyptic number.

It is an amenable number.

31371138436 is a deficient number, since it is larger than the sum of its proper divisors (28886656028).

31371138436 is a wasteful number, since it uses less digits than its factorization.

31371138436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4374291 (or 4374289 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The spelling of 31371138436 in words is "thirty-one billion, three hundred seventy-one million, one hundred thirty-eight thousand, four hundred thirty-six".