566521 has 2 divisors, whose sum is σ = 566522. Its totient is φ = 566520.

The previous prime is 566453. The next prime is 566537. The reversal of 566521 is 125665.

566521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 436921 + 129600 = 661^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 566521 - 2⁷ = 566393 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (566551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283260 + 283261.

It is an arithmetic number, because the mean of its divisors is an integer number (283261).

2⁵⁶⁶⁵²¹ is an apocalyptic number.

It is an amenable number.

566521 is a deficient number, since it is larger than the sum of its proper divisors (1).

566521 is an equidigital number, since it uses as much as digits as its factorization.

566521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 566521 is about 752.6758930642. The cubic root of 566521 is about 82.7444114114.

The spelling of 566521 in words is "five hundred sixty-six thousand, five hundred twenty-one".