204979555 has 16 divisors (see below), whose sum is σ = 268697088. Its totient is φ = 148876000.

The previous prime is 204979531. The next prime is 204979561. The reversal of 204979555 is 555979402.

It is a de Polignac number, because none of the positive numbers 2^k-204979555 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 48060 + ... + 52150.

It is an arithmetic number, because the mean of its divisors is an integer number (16793568).

Almost surely, 2^204979555 is an apocalyptic number.

204979555 is a deficient number, since it is larger than the sum of its proper divisors (63717533).

204979555 is a wasteful number, since it uses less digits than its factorization.

204979555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5018.

The product of its (nonzero) digits is 567000, while the sum is 46.

The square root of 204979555 is about 14317.1070751042. The cubic root of 204979555 is about 589.6172515153.

The spelling of 204979555 in words is "two hundred four million, nine hundred seventy-nine thousand, five hundred fifty-five".