18512203 has 2 divisors, whose sum is σ = 18512204. Its totient is φ = 18512202.

The previous prime is 18512161. The next prime is 18512227. The reversal of 18512203 is 30221581.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18512203 is a prime.

It is not a weakly prime, because it can be changed into another prime (18512243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9256101 + 9256102.

It is an arithmetic number, because the mean of its divisors is an integer number (9256102).

Almost surely, 2^18512203 is an apocalyptic number.

18512203 is a deficient number, since it is larger than the sum of its proper divisors (1).

18512203 is an equidigital number, since it uses as much as digits as its factorization.

18512203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18512203 is about 4302.5809696042. The cubic root of 18512203 is about 264.5367627928.

Adding to 18512203 its reverse (30221581), we get a palindrome (48733784).

The spelling of 18512203 in words is "eighteen million, five hundred twelve thousand, two hundred three".