18051911 has 2 divisors, whose sum is σ = 18051912. Its totient is φ = 18051910.

The previous prime is 18051857. The next prime is 18051923. The reversal of 18051911 is 11915081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18051911 - 2²² = 13857607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18051211) 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, 9025955 + 9025956.

It is an arithmetic number, because the mean of its divisors is an integer number (9025956).

Almost surely, 2^18051911 is an apocalyptic number.

18051911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18051911 is an equidigital number, since it uses as much as digits as its factorization.

18051911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 26.

The square root of 18051911 is about 4248.7540526606. The cubic root of 18051911 is about 262.3258333714.

Adding to 18051911 its reverse (11915081), we get a palindrome (29966992).

It can be divided in two parts, 18051 and 911, that multiplied together give a palindrome (16444461).

The spelling of 18051911 in words is "eighteen million, fifty-one thousand, nine hundred eleven".