18111161 has 16 divisors (see below), whose sum is σ = 19944960. Its totient is φ = 16381440.

The previous prime is 18111157. The next prime is 18111179. The reversal of 18111161 is 16111181.

It is a cyclic number.

It is not a de Polignac number, because 18111161 - 2² = 18111157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18111101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56975 + ... + 57291.

It is an arithmetic number, because the mean of its divisors is an integer number (1246560).

Almost surely, 2^18111161 is an apocalyptic number.

It is an amenable number.

18111161 is a deficient number, since it is larger than the sum of its proper divisors (1833799).

18111161 is a wasteful number, since it uses less digits than its factorization.

18111161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464.

The product of its digits is 48, while the sum is 20.

The square root of 18111161 is about 4255.7209729962. The cubic root of 18111161 is about 262.6125219792.

Adding to 18111161 its sum of digits (20), we get a palindrome (18111181).

The spelling of 18111161 in words is "eighteen million, one hundred eleven thousand, one hundred sixty-one".