225445921 has 16 divisors (see below), whose sum is σ = 238423248. Its totient is φ = 212889600.

The previous prime is 225445901. The next prime is 225445933. The reversal of 225445921 is 129544522.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 44408896 + 181037025 = 6664^2 + 13455^2 .

It is a cyclic number.

It is not a de Polignac number, because 225445921 - 2⁵ = 225445889 is a prime.

It is a deceptive number, since it divides R_225445920.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225445901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 535291 + ... + 535711.

It is an arithmetic number, because the mean of its divisors is an integer number (14901453).

Almost surely, 2^225445921 is an apocalyptic number.

It is an amenable number.

225445921 is a deficient number, since it is larger than the sum of its proper divisors (12977327).

225445921 is a wasteful number, since it uses less digits than its factorization.

225445921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852.

The product of its digits is 28800, while the sum is 34.

The square root of 225445921 is about 15014.8566759726. The cubic root of 225445921 is about 608.6217390884.

The spelling of 225445921 in words is "two hundred twenty-five million, four hundred forty-five thousand, nine hundred twenty-one".