204332591 has 2 divisors, whose sum is σ = 204332592. Its totient is φ = 204332590.

The previous prime is 204332567. The next prime is 204332671. The reversal of 204332591 is 195233402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204332591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204332291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102166295 + 102166296.

It is an arithmetic number, because the mean of its divisors is an integer number (102166296).

Almost surely, 2^204332591 is an apocalyptic number.

204332591 is a deficient number, since it is larger than the sum of its proper divisors (1).

204332591 is an equidigital number, since it uses as much as digits as its factorization.

204332591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 204332591 is about 14294.4951292447. The cubic root of 204332591 is about 588.9962738640.

Adding to 204332591 its reverse (195233402), we get a palindrome (399565993).

The spelling of 204332591 in words is "two hundred four million, three hundred thirty-two thousand, five hundred ninety-one".