225684621 has 12 divisors (see below), whose sum is σ = 328370172. Its totient is φ = 149357376.

The previous prime is 225684611. The next prime is 225684629. The reversal of 225684621 is 126486522.

It is a happy number.

225684621 is a `hidden beast` number, since 2 + 25 + 6 + 8 + 4 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 42380100 + 183304521 = 6510^2 + 13539^2 .

It is not a de Polignac number, because 225684621 - 2¹⁴ = 225668237 is a prime.

It is a hoax number, since the sum of its digits (36) 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 (225684629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90286 + ... + 92751.

It is an arithmetic number, because the mean of its divisors is an integer number (27364181).

Almost surely, 2^225684621 is an apocalyptic number.

It is an amenable number.

225684621 is a deficient number, since it is larger than the sum of its proper divisors (102685551).

225684621 is a wasteful number, since it uses less digits than its factorization.

225684621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183180 (or 183177 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 225684621 is about 15022.8033668820. The cubic root of 225684621 is about 608.8364642956.

The spelling of 225684621 in words is "two hundred twenty-five million, six hundred eighty-four thousand, six hundred twenty-one".