18018911 has 2 divisors, whose sum is σ = 18018912. Its totient is φ = 18018910.

The previous prime is 18018901. The next prime is 18018937. The reversal of 18018911 is 11981081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18018911 - 2¹⁰ = 18017887 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18018901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9009455 + 9009456.

It is an arithmetic number, because the mean of its divisors is an integer number (9009456).

Almost surely, 2^18018911 is an apocalyptic number.

18018911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18018911 is an equidigital number, since it uses as much as digits as its factorization.

18018911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 29.

The square root of 18018911 is about 4244.8687847800. The cubic root of 18018911 is about 262.1658866324.

Adding to 18018911 its reverse (11981081), we get a palindrome (29999992).

It can be divided in two parts, 180 and 18911, that added together give a palindrome (19091).

The spelling of 18018911 in words is "eighteen million, eighteen thousand, nine hundred eleven".