205284889 has 2 divisors, whose sum is σ = 205284890. Its totient is φ = 205284888.

The previous prime is 205284841. The next prime is 205284907. The reversal of 205284889 is 988482502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107433225 + 97851664 = 10365^2 + 9892^2 .

It is a cyclic number.

It is not a de Polignac number, because 205284889 - 2⁹ = 205284377 is a prime.

It is not a weakly prime, because it can be changed into another prime (205284839) 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, 102642444 + 102642445.

It is an arithmetic number, because the mean of its divisors is an integer number (102642445).

Almost surely, 2^205284889 is an apocalyptic number.

It is an amenable number.

205284889 is a deficient number, since it is larger than the sum of its proper divisors (1).

205284889 is an equidigital number, since it uses as much as digits as its factorization.

205284889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 368640, while the sum is 46.

The square root of 205284889 is about 14327.7663646501. The cubic root of 205284889 is about 589.9098674916.

The spelling of 205284889 in words is "two hundred five million, two hundred eighty-four thousand, eight hundred eighty-nine".