204999559 has 6 divisors (see below), whose sum is σ = 211826760. Its totient is φ = 198385740.

The previous prime is 204999517. The next prime is 204999593. The reversal of 204999559 is 955999402.

It is not a de Polignac number, because 204999559 - 2¹¹ = 204997511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204999059) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105699 + ... + 107620.

It is an arithmetic number, because the mean of its divisors is an integer number (35304460).

Almost surely, 2^204999559 is an apocalyptic number.

204999559 is a deficient number, since it is larger than the sum of its proper divisors (6827201).

204999559 is an equidigital number, since it uses as much as digits as its factorization.

204999559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213381 (or 213350 counting only the distinct ones).

The product of its (nonzero) digits is 1312200, while the sum is 52.

The square root of 204999559 is about 14317.8056628800. The cubic root of 204999559 is about 589.6364311840.

The spelling of 204999559 in words is "two hundred four million, nine hundred ninety-nine thousand, five hundred fifty-nine".