866573 has 2 divisors, whose sum is σ = 866574. Its totient is φ = 866572.

The previous prime is 866519. The next prime is 866581. The reversal of 866573 is 375668.

It is a happy number.

866573 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., 708964 + 157609 = 842^2 + 397^2 .

It is a cyclic number.

It is not a de Polignac number, because 866573 - 2¹⁴ = 850189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433286 + 433287.

It is an arithmetic number, because the mean of its divisors is an integer number (433287).

2⁸⁶⁶⁵⁷³ is an apocalyptic number.

It is an amenable number.

866573 is a deficient number, since it is larger than the sum of its proper divisors (1).

866573 is an equidigital number, since it uses as much as digits as its factorization.

866573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 866573 is about 930.8990278220. The cubic root of 866573 is about 95.3385153208.

The spelling of 866573 in words is "eight hundred sixty-six thousand, five hundred seventy-three".