91190238172 has 72 divisors (see below), whose sum is σ = 183702804768. Its totient is φ = 39503460480.

The previous prime is 91190238131. The next prime is 91190238187. The reversal of 91190238172 is 27183209119.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3068778 + ... + 3098350.

It is an arithmetic number, because the mean of its divisors is an integer number (2551427844).

Almost surely, 2^91190238172 is an apocalyptic number.

91190238172 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

91190238172 is an abundant number, since it is smaller than the sum of its proper divisors (92512566596).

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

91190238172 is a wasteful number, since it uses less digits than its factorization.

91190238172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29899 (or 29886 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 43.

The spelling of 91190238172 in words is "ninety-one billion, one hundred ninety million, two hundred thirty-eight thousand, one hundred seventy-two".