565891 has 2 divisors, whose sum is σ = 565892. Its totient is φ = 565890.

The previous prime is 565889. The next prime is 565907. The reversal of 565891 is 198565.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 565891 - 2¹ = 565889 is a prime.

Together with 565889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (565391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282945 + 282946.

It is an arithmetic number, because the mean of its divisors is an integer number (282946).

2⁵⁶⁵⁸⁹¹ is an apocalyptic number.

565891 is a deficient number, since it is larger than the sum of its proper divisors (1).

565891 is an equidigital number, since it uses as much as digits as its factorization.

565891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 565891 is about 752.2572698220. The cubic root of 565891 is about 82.7137280449.

The spelling of 565891 in words is "five hundred sixty-five thousand, eight hundred ninety-one".