18224563 has 4 divisors (see below), whose sum is σ = 20828080. Its totient is φ = 15621048.

The previous prime is 18224551. The next prime is 18224567. The reversal of 18224563 is 36542281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18224563 - 2²¹ = 16127411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18224567) 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, 1301748 + ... + 1301761.

It is an arithmetic number, because the mean of its divisors is an integer number (5207020).

Almost surely, 2^18224563 is an apocalyptic number.

18224563 is a deficient number, since it is larger than the sum of its proper divisors (2603517).

18224563 is an equidigital number, since it uses as much as digits as its factorization.

18224563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2603516.

The product of its digits is 11520, while the sum is 31.

The square root of 18224563 is about 4269.0236588710. The cubic root of 18224563 is about 263.1594930549.

The spelling of 18224563 in words is "eighteen million, two hundred twenty-four thousand, five hundred sixty-three".