225408209 has 4 divisors (see below), whose sum is σ = 242747316. Its totient is φ = 208069104.

The previous prime is 225408203. The next prime is 225408217. The reversal of 225408209 is 902804522.

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 105987025 + 119421184 = 10295^2 + 10928^2 .

It is a cyclic number.

It is not a de Polignac number, because 225408209 - 2⁸ = 225407953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225408203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8669534 + ... + 8669559.

It is an arithmetic number, because the mean of its divisors is an integer number (60686829).

Almost surely, 2^225408209 is an apocalyptic number.

It is an amenable number.

225408209 is a deficient number, since it is larger than the sum of its proper divisors (17339107).

225408209 is a wasteful number, since it uses less digits than its factorization.

225408209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17339106.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 225408209 is about 15013.6008006074. The cubic root of 225408209 is about 608.5878009820.

The spelling of 225408209 in words is "two hundred twenty-five million, four hundred eight thousand, two hundred nine".