204560009 has 4 divisors (see below), whose sum is σ = 204690816. Its totient is φ = 204429204.

The previous prime is 204559981. The next prime is 204560033. The reversal of 204560009 is 900065402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204560009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204560009.

It is not an unprimeable number, because it can be changed into a prime (204560039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63029 + ... + 66194.

It is an arithmetic number, because the mean of its divisors is an integer number (51172704).

Almost surely, 2^204560009 is an apocalyptic number.

It is an amenable number.

204560009 is a deficient number, since it is larger than the sum of its proper divisors (130807).

204560009 is a wasteful number, since it uses less digits than its factorization.

204560009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130806.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 204560009 is about 14302.4476576564. The cubic root of 204560009 is about 589.2147064542.

The spelling of 204560009 in words is "two hundred four million, five hundred sixty thousand, nine".