225479621 has 4 divisors (see below), whose sum is σ = 225624000. Its totient is φ = 225335244.

The previous prime is 225479609. The next prime is 225479627. The reversal of 225479621 is 126974522.

225479621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225479621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225479627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69821 + ... + 72978.

It is an arithmetic number, because the mean of its divisors is an integer number (56406000).

Almost surely, 2^225479621 is an apocalyptic number.

It is an amenable number.

225479621 is a deficient number, since it is larger than the sum of its proper divisors (144379).

225479621 is a wasteful number, since it uses less digits than its factorization.

225479621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144378.

The product of its digits is 60480, while the sum is 38.

The square root of 225479621 is about 15015.9788558722. The cubic root of 225479621 is about 608.6520634793.

The spelling of 225479621 in words is "two hundred twenty-five million, four hundred seventy-nine thousand, six hundred twenty-one".