2172692131891 has 16 divisors (see below), whose sum is σ = 2303353922688. Its totient is φ = 2042348774400.

The previous prime is 2172692131867. The next prime is 2172692131903. The reversal of 2172692131891 is 1981312962712.

It is not a de Polignac number, because 2172692131891 - 2⁵ = 2172692131859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2172692131691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79047871 + ... + 79075351.

It is an arithmetic number, because the mean of its divisors is an integer number (143959620168).

Almost surely, 2^{2172692131891} is an apocalyptic number.

2172692131891 is a deficient number, since it is larger than the sum of its proper divisors (130661790797).

2172692131891 is a wasteful number, since it uses less digits than its factorization.

2172692131891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33102.

The product of its digits is 653184, while the sum is 52.

The spelling of 2172692131891 in words is "two trillion, one hundred seventy-two billion, six hundred ninety-two million, one hundred thirty-one thousand, eight hundred ninety-one".