172521912 has 16 divisors (see below), whose sum is σ = 431304840. Its totient is φ = 57507296.

The previous prime is 172521907. The next prime is 172521931. The reversal of 172521912 is 219125271.

It is a self number, because there is not a number n which added to its sum of digits gives 172521912.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 3594183 + ... + 3594230.

Almost surely, 2^172521912 is an apocalyptic number.

172521912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172521912 is an abundant number, since it is smaller than the sum of its proper divisors (258782928).

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

172521912 is a wasteful number, since it uses less digits than its factorization.

172521912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7188422 (or 7188418 counting only the distinct ones).

The product of its digits is 2520, while the sum is 30.

The square root of 172521912 is about 13134.7596856585. The cubic root of 172521912 is about 556.6917102211.

The spelling of 172521912 in words is "one hundred seventy-two million, five hundred twenty-one thousand, nine hundred twelve".