320563 has 2 divisors, whose sum is σ = 320564. Its totient is φ = 320562.

The previous prime is 320561. The next prime is 320591. The reversal of 320563 is 365023.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 320563 - 2¹ = 320561 is a prime.

Together with 320561, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 320563.

It is not a weakly prime, because it can be changed into another prime (320561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160281 + 160282.

It is an arithmetic number, because the mean of its divisors is an integer number (160282).

2³²⁰⁵⁶³ is an apocalyptic number.

320563 is a deficient number, since it is larger than the sum of its proper divisors (1).

320563 is an equidigital number, since it uses as much as digits as its factorization.

320563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 320563 is about 566.1828326610. The cubic root of 320563 is about 68.4391275511.

Subtracting from 320563 its product of nonzero digits (540), we obtain a palindrome (320023).

Adding to 320563 its reverse (365023), we get a palindrome (685586).

The spelling of 320563 in words is "three hundred twenty thousand, five hundred sixty-three".