18822563 has 4 divisors (see below), whose sum is σ = 18831360. Its totient is φ = 18813768.

The previous prime is 18822547. The next prime is 18822569. The reversal of 18822563 is 36522881.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18822563 - 2⁴ = 18822547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18822569) 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, 1118 + ... + 6236.

It is an arithmetic number, because the mean of its divisors is an integer number (4707840).

Almost surely, 2^18822563 is an apocalyptic number.

18822563 is a deficient number, since it is larger than the sum of its proper divisors (8797).

18822563 is an equidigital number, since it uses as much as digits as its factorization.

18822563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8796.

The product of its digits is 23040, while the sum is 35.

The square root of 18822563 is about 4338.4977814907. The cubic root of 18822563 is about 266.0069108951.

The spelling of 18822563 in words is "eighteen million, eight hundred twenty-two thousand, five hundred sixty-three".