204491671 has 2 divisors, whose sum is σ = 204491672. Its totient is φ = 204491670.

The previous prime is 204491663. The next prime is 204491681. The reversal of 204491671 is 176194402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204491671 - 2³ = 204491663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204491621) 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, 102245835 + 102245836.

It is an arithmetic number, because the mean of its divisors is an integer number (102245836).

Almost surely, 2^204491671 is an apocalyptic number.

204491671 is a deficient number, since it is larger than the sum of its proper divisors (1).

204491671 is an equidigital number, since it uses as much as digits as its factorization.

204491671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 204491671 is about 14300.0584264541. The cubic root of 204491671 is about 589.1490855483.

The spelling of 204491671 in words is "two hundred four million, four hundred ninety-one thousand, six hundred seventy-one".