566991 has 12 divisors (see below), whose sum is σ = 831168. Its totient is φ = 372384.

The previous prime is 566987. The next prime is 566999. The reversal of 566991 is 199665.

566991 is a `hidden beast` number, since 566 + 9 + 91 = 666.

It is not a de Polignac number, because 566991 - 2² = 566987 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 566991.

It is not an unprimeable number, because it can be changed into a prime (566999) 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 in 11 ways as a sum of consecutive naturals, for example, 226 + ... + 1088.

It is an arithmetic number, because the mean of its divisors is an integer number (69264).

2⁵⁶⁶⁹⁹¹ is an apocalyptic number.

566991 is a deficient number, since it is larger than the sum of its proper divisors (264177).

566991 is a wasteful number, since it uses less digits than its factorization.

566991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942 (or 939 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 566991 is about 752.9880477139. The cubic root of 566991 is about 82.7672873646.

The spelling of 566991 in words is "five hundred sixty-six thousand, nine hundred ninety-one".