204388861 has 2 divisors, whose sum is σ = 204388862. Its totient is φ = 204388860.

The previous prime is 204388819. The next prime is 204388867. The reversal of 204388861 is 168883402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166023225 + 38365636 = 12885^2 + 6194^2 .

It is a cyclic number.

It is not a de Polignac number, because 204388861 - 2⁷ = 204388733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204388867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102194430 + 102194431.

It is an arithmetic number, because the mean of its divisors is an integer number (102194431).

Almost surely, 2^204388861 is an apocalyptic number.

It is an amenable number.

204388861 is a deficient number, since it is larger than the sum of its proper divisors (1).

204388861 is an equidigital number, since it uses as much as digits as its factorization.

204388861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 204388861 is about 14296.4632339610. The cubic root of 204388861 is about 589.0503356892.

The spelling of 204388861 in words is "two hundred four million, three hundred eighty-eight thousand, eight hundred sixty-one".