18115211 has 2 divisors, whose sum is σ = 18115212. Its totient is φ = 18115210.

The previous prime is 18115193. The next prime is 18115213. The reversal of 18115211 is 11251181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18115211 - 2⁶ = 18115147 is a prime.

It is a Sophie Germain prime.

Together with 18115213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18115213) 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, 9057605 + 9057606.

It is an arithmetic number, because the mean of its divisors is an integer number (9057606).

Almost surely, 2^18115211 is an apocalyptic number.

18115211 is a deficient number, since it is larger than the sum of its proper divisors (1).

18115211 is an equidigital number, since it uses as much as digits as its factorization.

18115211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80, while the sum is 20.

The square root of 18115211 is about 4256.1967764661. The cubic root of 18115211 is about 262.6320955715.

Adding to 18115211 its reverse (11251181), we get a palindrome (29366392).

The spelling of 18115211 in words is "eighteen million, one hundred fifteen thousand, two hundred eleven".