204351643 has 2 divisors, whose sum is σ = 204351644. Its totient is φ = 204351642.

The previous prime is 204351613. The next prime is 204351649. The reversal of 204351643 is 346153402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204351643 - 2⁹ = 204351131 is a prime.

It is not a weakly prime, because it can be changed into another prime (204351649) 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, 102175821 + 102175822.

It is an arithmetic number, because the mean of its divisors is an integer number (102175822).

Almost surely, 2^204351643 is an apocalyptic number.

204351643 is a deficient number, since it is larger than the sum of its proper divisors (1).

204351643 is an equidigital number, since it uses as much as digits as its factorization.

204351643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 204351643 is about 14295.1615240962. The cubic root of 204351643 is about 589.0145793273.

The spelling of 204351643 in words is "two hundred four million, three hundred fifty-one thousand, six hundred forty-three".