566981 has 4 divisors (see below), whose sum is σ = 571200. Its totient is φ = 562764.

The previous prime is 566977. The next prime is 566987. The reversal of 566981 is 189665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 566981 - 2² = 566977 is a prime.

It is a super-2 number, since 2×566981² = 642934908722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

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 566981.

It is not an unprimeable number, because it can be changed into a prime (566987) 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, 1901 + ... + 2178.

It is an arithmetic number, because the mean of its divisors is an integer number (142800).

2⁵⁶⁶⁹⁸¹ is an apocalyptic number.

It is an amenable number.

566981 is a deficient number, since it is larger than the sum of its proper divisors (4219).

566981 is a wasteful number, since it uses less digits than its factorization.

566981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4218.

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

The square root of 566981 is about 752.9814074730. The cubic root of 566981 is about 82.7668007739.

The spelling of 566981 in words is "five hundred sixty-six thousand, nine hundred eighty-one".