225521472 has 56 divisors (see below), whose sum is σ = 650943072. Its totient is φ = 68339200.

The previous prime is 225521467. The next prime is 225521479. The reversal of 225521472 is 274125522.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225521479) by changing a digit.

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, 51279 + ... + 55502.

Almost surely, 2^225521472 is an apocalyptic number.

225521472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

225521472 is an abundant number, since it is smaller than the sum of its proper divisors (425421600).

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

225521472 is a wasteful number, since it uses less digits than its factorization.

225521472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106807 (or 106797 counting only the distinct ones).

The product of its digits is 11200, while the sum is 30.

The square root of 225521472 is about 15017.3723400600. The cubic root of 225521472 is about 608.6897182078.

Adding to 225521472 its reverse (274125522), we get a palindrome (499646994).

The spelling of 225521472 in words is "two hundred twenty-five million, five hundred twenty-one thousand, four hundred seventy-two".