18111329 has 2 divisors, whose sum is σ = 18111330. Its totient is φ = 18111328.

The previous prime is 18111311. The next prime is 18111337. The reversal of 18111329 is 92311181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13337104 + 4774225 = 3652^2 + 2185^2 .

It is an emirp because it is prime and its reverse (92311181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18111329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18111298 and 18111307.

It is not a weakly prime, because it can be changed into another prime (18111349) 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, 9055664 + 9055665.

It is an arithmetic number, because the mean of its divisors is an integer number (9055665).

Almost surely, 2^18111329 is an apocalyptic number.

It is an amenable number.

18111329 is a deficient number, since it is larger than the sum of its proper divisors (1).

18111329 is an equidigital number, since it uses as much as digits as its factorization.

18111329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 26.

The square root of 18111329 is about 4255.7407110866. The cubic root of 18111329 is about 262.6133339788.

The spelling of 18111329 in words is "eighteen million, one hundred eleven thousand, three hundred twenty-nine".