225172100 has 36 divisors (see below), whose sum is σ = 490624848. Its totient is φ = 89700000.

The previous prime is 225172081. The next prime is 225172141. The reversal of 225172100 is 1271522.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20615 + ... + 29585.

It is an arithmetic number, because the mean of its divisors is an integer number (13628468).

Almost surely, 2^225172100 is an apocalyptic number.

225172100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225172100 is an abundant number, since it is smaller than the sum of its proper divisors (265452748).

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

225172100 is a wasteful number, since it uses less digits than its factorization.

225172100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9236 (or 9229 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 225172100 is about 15005.7355701079. The cubic root of 225172100 is about 608.3752336603.

The spelling of 225172100 in words is "two hundred twenty-five million, one hundred seventy-two thousand, one hundred".