225625021 has 2 divisors, whose sum is σ = 225625022. Its totient is φ = 225625020.

The previous prime is 225624991. The next prime is 225625039. The reversal of 225625021 is 120526522.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151905625 + 73719396 = 12325^2 + 8586^2 .

It is a cyclic number.

It is not a de Polignac number, because 225625021 - 2⁵ = 225624989 is a prime.

It is equal to p_12415219 and since 225625021 and 12415219 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225425021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112812510 + 112812511.

It is an arithmetic number, because the mean of its divisors is an integer number (112812511).

Almost surely, 2^225625021 is an apocalyptic number.

It is an amenable number.

225625021 is a deficient number, since it is larger than the sum of its proper divisors (1).

225625021 is an equidigital number, since it uses as much as digits as its factorization.

225625021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 225625021 is about 15020.8195848296. The cubic root of 225625021 is about 608.7828646487.

The spelling of 225625021 in words is "two hundred twenty-five million, six hundred twenty-five thousand, twenty-one".