100172172 has 24 divisors (see below), whose sum is σ = 240053296. Its totient is φ = 32488128.

The previous prime is 100172141. The next prime is 100172183. The reversal of 100172172 is 271271001.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112363 + ... + 113250.

Almost surely, 2^100172172 is an apocalyptic number.

100172172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

100172172 is an abundant number, since it is smaller than the sum of its proper divisors (139881124).

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

100172172 is a wasteful number, since it uses less digits than its factorization.

100172172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225657 (or 225655 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 100172172 is about 10008.6048977867. The cubic root of 100172172 is about 464.4251145054.

The spelling of 100172172 in words is "one hundred million, one hundred seventy-two thousand, one hundred seventy-two".