31171122396 has 18 divisors (see below), whose sum is σ = 78793670592. Its totient is φ = 10390374120.

The previous prime is 31171122373. The next prime is 31171122457. The reversal of 31171122396 is 69322117113.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 865864511 = 31171122396 / (3 + 1 + 1 + 7 + 1 + 1 + 2 + 2 + 3 + 9 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 31171122396.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 432932220 + ... + 432932291.

It is an arithmetic number, because the mean of its divisors is an integer number (4377426144).

Almost surely, 2^31171122396 is an apocalyptic number.

31171122396 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31171122396 is an abundant number, since it is smaller than the sum of its proper divisors (47622548196).

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

31171122396 is a wasteful number, since it uses less digits than its factorization.

31171122396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865864521 (or 865864516 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The spelling of 31171122396 in words is "thirty-one billion, one hundred seventy-one million, one hundred twenty-two thousand, three hundred ninety-six".