191372172 has 24 divisors (see below), whose sum is σ = 450634800. Its totient is φ = 63205056.

The previous prime is 191372119. The next prime is 191372183. The reversal of 191372172 is 271273191.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71847 + ... + 74462.

It is an arithmetic number, because the mean of its divisors is an integer number (18776450).

Almost surely, 2^191372172 is an apocalyptic number.

191372172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

191372172 is an abundant number, since it is smaller than the sum of its proper divisors (259262628).

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

191372172 is a wasteful number, since it uses less digits than its factorization.

191372172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146425 (or 146423 counting only the distinct ones).

The product of its digits is 5292, while the sum is 33.

The square root of 191372172 is about 13833.7331187211. The cubic root of 191372172 is about 576.2703326928.

The spelling of 191372172 in words is "one hundred ninety-one million, three hundred seventy-two thousand, one hundred seventy-two".