18045111 has 16 divisors (see below), whose sum is σ = 27661824. Its totient is φ = 10249824.

The previous prime is 18045067. The next prime is 18045173. The reversal of 18045111 is 11154081.

It is a happy number.

It is not a de Polignac number, because 18045111 - 2¹⁴ = 18028727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18044111) 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 in 15 ways as a sum of consecutive naturals, for example, 1150 + ... + 6116.

It is an arithmetic number, because the mean of its divisors is an integer number (1728864).

Almost surely, 2^18045111 is an apocalyptic number.

18045111 is a deficient number, since it is larger than the sum of its proper divisors (9616713).

18045111 is a wasteful number, since it uses less digits than its factorization.

18045111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5150.

The product of its (nonzero) digits is 160, while the sum is 21.

The square root of 18045111 is about 4247.9537426860. The cubic root of 18045111 is about 262.2928906044.

Adding to 18045111 its reverse (11154081), we get a palindrome (29199192).

The spelling of 18045111 in words is "eighteen million, forty-five thousand, one hundred eleven".