566391 has 12 divisors (see below), whose sum is σ = 878712. Its totient is φ = 323568.

The previous prime is 566387. The next prime is 566393. The reversal of 566391 is 193665.

It is a happy number.

566391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 566391 - 2² = 566387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (566393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1780 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (73226).

2⁵⁶⁶³⁹¹ is an apocalyptic number.

566391 is a deficient number, since it is larger than the sum of its proper divisors (312321).

566391 is a wasteful number, since it uses less digits than its factorization.

566391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3870 (or 3863 counting only the distinct ones).

The product of its digits is 4860, while the sum is 30.

The square root of 566391 is about 752.5895295578. The cubic root of 566391 is about 82.7380817865.

The spelling of 566391 in words is "five hundred sixty-six thousand, three hundred ninety-one".