225409 has 4 divisors (see below), whose sum is σ = 229716. Its totient is φ = 221104.

The previous prime is 225383. The next prime is 225427. The reversal of 225409 is 904522.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87025 + 138384 = 295^2 + 372^2 .

It is a cyclic number.

It is not a de Polignac number, because 225409 - 2⁹ = 224897 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 225409.

It is not an unprimeable number, because it can be changed into a prime (225479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2074 + ... + 2179.

It is an arithmetic number, because the mean of its divisors is an integer number (57429).

2²²⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

225409 is a deficient number, since it is larger than the sum of its proper divisors (4307).

225409 is an equidigital number, since it uses as much as digits as its factorization.

225409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4306.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 225409 is about 474.7725771356. The cubic root of 225409 is about 60.8588512864.

The spelling of 225409 in words is "two hundred twenty-five thousand, four hundred nine".