18115243 has 2 divisors, whose sum is σ = 18115244. Its totient is φ = 18115242.

The previous prime is 18115219. The next prime is 18115261. The reversal of 18115243 is 34251181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18115243 - 2⁵ = 18115211 is a prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (18115213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9057621 + 9057622.

It is an arithmetic number, because the mean of its divisors is an integer number (9057622).

Almost surely, 2^18115243 is an apocalyptic number.

18115243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18115243 is an equidigital number, since it uses as much as digits as its factorization.

18115243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 25.

The square root of 18115243 is about 4256.2005356891. The cubic root of 18115243 is about 262.6322502154.

The spelling of 18115243 in words is "eighteen million, one hundred fifteen thousand, two hundred forty-three".