206447489 has 2 divisors, whose sum is σ = 206447490. Its totient is φ = 206447488.

The previous prime is 206447467. The next prime is 206447503. The reversal of 206447489 is 984744602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201157489 + 5290000 = 14183^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 206447489 - 2⁸ = 206447233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206447459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103223744 + 103223745.

It is an arithmetic number, because the mean of its divisors is an integer number (103223745).

Almost surely, 2^206447489 is an apocalyptic number.

It is an amenable number.

206447489 is a deficient number, since it is larger than the sum of its proper divisors (1).

206447489 is an equidigital number, since it uses as much as digits as its factorization.

206447489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 206447489 is about 14368.2806556665. The cubic root of 206447489 is about 591.0213936520.

The spelling of 206447489 in words is "two hundred six million, four hundred forty-seven thousand, four hundred eighty-nine".