31109972161 has 8 divisors (see below), whose sum is σ = 31462905600. Its totient is φ = 30757114080.

The previous prime is 31109972143. The next prime is 31109972177. The reversal of 31109972161 is 16127990113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31109972161 - 2²³ = 31101583553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31109972141) 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, 1491160 + ... + 1511878.

It is an arithmetic number, because the mean of its divisors is an integer number (3932863200).

Almost surely, 2^31109972161 is an apocalyptic number.

It is an amenable number.

31109972161 is a deficient number, since it is larger than the sum of its proper divisors (352933439).

31109972161 is a wasteful number, since it uses less digits than its factorization.

31109972161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37679.

The product of its (nonzero) digits is 20412, while the sum is 40.

The spelling of 31109972161 in words is "thirty-one billion, one hundred nine million, nine hundred seventy-two thousand, one hundred sixty-one".