225565 has 8 divisors (see below), whose sum is σ = 273240. Its totient is φ = 178752.

The previous prime is 225529. The next prime is 225569. The reversal of 225565 is 565522.

It can be written as a sum of positive squares in 4 ways, for example, as 139129 + 86436 = 373^2 + 294^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225565 is a prime.

It is an Ulam number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225569) 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, 871 + ... + 1099.

It is an arithmetic number, because the mean of its divisors is an integer number (34155).

2²²⁵⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

225565 is a deficient number, since it is larger than the sum of its proper divisors (47675).

225565 is a wasteful number, since it uses less digits than its factorization.

225565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431.

The product of its digits is 3000, while the sum is 25.

The square root of 225565 is about 474.9368379058. The cubic root of 225565 is about 60.8728876847.

The spelling of 225565 in words is "two hundred twenty-five thousand, five hundred sixty-five".