18013111 has 2 divisors, whose sum is σ = 18013112. Its totient is φ = 18013110.

The previous prime is 18013109. The next prime is 18013123. The reversal of 18013111 is 11131081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18013111 - 2¹ = 18013109 is a prime.

Together with 18013109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18013141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9006555 + 9006556.

It is an arithmetic number, because the mean of its divisors is an integer number (9006556).

Almost surely, 2^18013111 is an apocalyptic number.

18013111 is a deficient number, since it is larger than the sum of its proper divisors (1).

18013111 is an equidigital number, since it uses as much as digits as its factorization.

18013111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 16.

The square root of 18013111 is about 4244.1855520229. The cubic root of 18013111 is about 262.1377546083.

Adding to 18013111 its reverse (11131081), we get a palindrome (29144192).

The spelling of 18013111 in words is "eighteen million, thirteen thousand, one hundred eleven".