204979081 has 4 divisors (see below), whose sum is σ = 217036692. Its totient is φ = 192921472.

The previous prime is 204979051. The next prime is 204979121. The reversal of 204979081 is 180979402.

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 191407225 + 13571856 = 13835^2 + 3684^2 .

It is a cyclic number.

It is not a de Polignac number, because 204979081 - 2⁹ = 204978569 is a prime.

It is a super-2 number, since 2×204979081² = 84032847295209122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204979031) 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, 6028780 + ... + 6028813.

It is an arithmetic number, because the mean of its divisors is an integer number (54259173).

Almost surely, 2^204979081 is an apocalyptic number.

It is an amenable number.

204979081 is a deficient number, since it is larger than the sum of its proper divisors (12057611).

204979081 is a wasteful number, since it uses less digits than its factorization.

204979081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12057610.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 204979081 is about 14317.0905214712. The cubic root of 204979081 is about 589.6167970329.

The spelling of 204979081 in words is "two hundred four million, nine hundred seventy-nine thousand, eighty-one".