225609 has 8 divisors (see below), whose sum is σ = 303360. Its totient is φ = 149136.

The previous prime is 225601. The next prime is 225611. The reversal of 225609 is 906522.

225609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 225609 - 2³ = 225601 is a prime.

It is an Ulam number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (225601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232 + ... + 710.

It is an arithmetic number, because the mean of its divisors is an integer number (37920).

2²²⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

225609 is a deficient number, since it is larger than the sum of its proper divisors (77751).

225609 is a wasteful number, since it uses less digits than its factorization.

225609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 225609 is about 474.9831575961. The cubic root of 225609 is about 60.8768454986.

The spelling of 225609 in words is "two hundred twenty-five thousand, six hundred nine".