563809 has 2 divisors, whose sum is σ = 563810. Its totient is φ = 563808.

The previous prime is 563777. The next prime is 563813. The reversal of 563809 is 908365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451584 + 112225 = 672^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 563809 - 2⁵ = 563777 is a prime.

It is not a weakly prime, because it can be changed into another prime (563869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 281904 + 281905.

It is an arithmetic number, because the mean of its divisors is an integer number (281905).

2⁵⁶³⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

563809 is a deficient number, since it is larger than the sum of its proper divisors (1).

563809 is an equidigital number, since it uses as much as digits as its factorization.

563809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 563809 is about 750.8721595585. The cubic root of 563809 is about 82.6121645458.

The spelling of 563809 in words is "five hundred sixty-three thousand, eight hundred nine".