8573 has 2 divisors, whose sum is σ = 8574. Its totient is φ = 8572.

The previous prime is 8563. The next prime is 8581. The reversal of 8573 is 3758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6724 + 1849 = 82^2 + 43^2 .

It is a cyclic number.

It is not a de Polignac number, because 8573 - 2⁸ = 8317 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4286 + 4287.

It is an arithmetic number, because the mean of its divisors is an integer number (4287).

2⁸⁵⁷³ is an apocalyptic number.

It is an amenable number.

8573 is a deficient number, since it is larger than the sum of its proper divisors (1).

8573 is an equidigital number, since it uses as much as digits as its factorization.

8573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 23.

The square root of 8573 is about 92.5904962726. The cubic root of 8573 is about 20.4665327416.

The spelling of 8573 in words is "eight thousand, five hundred seventy-three".