18113203 has 2 divisors, whose sum is σ = 18113204. Its totient is φ = 18113202.

The previous prime is 18113159. The next prime is 18113209. The reversal of 18113203 is 30231181.

It is a strong prime.

It is an emirp because it is prime and its reverse (30231181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18113203 - 2²¹ = 16016051 is a prime.

It is not a weakly prime, because it can be changed into another prime (18113209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9056601 + 9056602.

It is an arithmetic number, because the mean of its divisors is an integer number (9056602).

Almost surely, 2^18113203 is an apocalyptic number.

18113203 is a deficient number, since it is larger than the sum of its proper divisors (1).

18113203 is an equidigital number, since it uses as much as digits as its factorization.

18113203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 18113203 is about 4255.9608785796. The cubic root of 18113203 is about 262.6223913008.

Adding to 18113203 its reverse (30231181), we get a palindrome (48344384).

The spelling of 18113203 in words is "eighteen million, one hundred thirteen thousand, two hundred three".