204425109 has 18 divisors (see below), whose sum is σ = 343490550. Its totient is φ = 116814096.

The previous prime is 204425087. The next prime is 204425131. The reversal of 204425109 is 901524402.

It is an interprime number because it is at equal distance from previous prime (204425087) and next prime (204425131).

It can be written as a sum of positive squares in only one way, i.e., 183467025 + 20958084 = 13545^2 + 4578^2 .

It is not a de Polignac number, because 204425109 - 2¹² = 204421013 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204425189) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 231334 + ... + 232215.

Almost surely, 2^204425109 is an apocalyptic number.

It is an amenable number.

204425109 is a deficient number, since it is larger than the sum of its proper divisors (139065441).

204425109 is a wasteful number, since it uses less digits than its factorization.

204425109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463569 (or 463559 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 204425109 is about 14297.7309038882. The cubic root of 204425109 is about 589.0851559730.

The spelling of 204425109 in words is "two hundred four million, four hundred twenty-five thousand, one hundred nine".