204937861 has 2 divisors, whose sum is σ = 204937862. Its totient is φ = 204937860.

The previous prime is 204937823. The next prime is 204937883. The reversal of 204937861 is 168739402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161772961 + 43164900 = 12719^2 + 6570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204937861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204937801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102468930 + 102468931.

It is an arithmetic number, because the mean of its divisors is an integer number (102468931).

Almost surely, 2^204937861 is an apocalyptic number.

It is an amenable number.

204937861 is a deficient number, since it is larger than the sum of its proper divisors (1).

204937861 is an equidigital number, since it uses as much as digits as its factorization.

204937861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 204937861 is about 14315.6509108039. The cubic root of 204937861 is about 589.5772716440.

The spelling of 204937861 in words is "two hundred four million, nine hundred thirty-seven thousand, eight hundred sixty-one".