204818641 has 2 divisors, whose sum is σ = 204818642. Its totient is φ = 204818640.

The previous prime is 204818633. The next prime is 204818671. The reversal of 204818641 is 146818402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167961600 + 36857041 = 12960^2 + 6071^2 .

It is a cyclic number.

It is not a de Polignac number, because 204818641 - 2³ = 204818633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204818597 and 204818606.

It is not a weakly prime, because it can be changed into another prime (204818671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102409320 + 102409321.

It is an arithmetic number, because the mean of its divisors is an integer number (102409321).

Almost surely, 2^204818641 is an apocalyptic number.

It is an amenable number.

204818641 is a deficient number, since it is larger than the sum of its proper divisors (1).

204818641 is an equidigital number, since it uses as much as digits as its factorization.

204818641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 204818641 is about 14311.4863309162. The cubic root of 204818641 is about 589.4629231022.

The spelling of 204818641 in words is "two hundred four million, eight hundred eighteen thousand, six hundred forty-one".