566891 has 4 divisors (see below), whose sum is σ = 610512. Its totient is φ = 523272.

The previous prime is 566879. The next prime is 566911. The reversal of 566891 is 198665.

566891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198665 = 5 ⋅39733.

It is a cyclic number.

It is not a de Polignac number, because 566891 - 2¹⁰ = 565867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (566821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21791 + ... + 21816.

It is an arithmetic number, because the mean of its divisors is an integer number (152628).

2⁵⁶⁶⁸⁹¹ is an apocalyptic number.

566891 is a deficient number, since it is larger than the sum of its proper divisors (43621).

566891 is a wasteful number, since it uses less digits than its factorization.

566891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43620.

The product of its digits is 12960, while the sum is 35.

The square root of 566891 is about 752.9216426694. The cubic root of 566891 is about 82.7624211996.

The spelling of 566891 in words is "five hundred sixty-six thousand, eight hundred ninety-one".