18049111 has 4 divisors (see below), whose sum is σ = 18252000. Its totient is φ = 17846224.

The previous prime is 18049091. The next prime is 18049127. The reversal of 18049111 is 11194081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11194081 = 131 ⋅85451.

It is a cyclic number.

It is not a de Polignac number, because 18049111 - 2⁵ = 18049079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18049511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101311 + ... + 101488.

It is an arithmetic number, because the mean of its divisors is an integer number (4563000).

Almost surely, 2^18049111 is an apocalyptic number.

18049111 is a deficient number, since it is larger than the sum of its proper divisors (202889).

18049111 is an equidigital number, since it uses as much as digits as its factorization.

18049111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202888.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 18049111 is about 4248.4245315175. The cubic root of 18049111 is about 262.3122697047.

The spelling of 18049111 in words is "eighteen million, forty-nine thousand, one hundred eleven".