181118 has 16 divisors (see below), whose sum is σ = 329184. Its totient is φ = 72960.

The previous prime is 181087. The next prime is 181123. The reversal of 181118 is 811181.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 181118.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 143 + ... + 618.

It is an arithmetic number, because the mean of its divisors is an integer number (20574).

2¹⁸¹¹¹⁸ is an apocalyptic number.

181118 is a deficient number, since it is larger than the sum of its proper divisors (148066).

181118 is a wasteful number, since it uses less digits than its factorization.

181118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787.

The product of its digits is 64, while the sum is 20.

The square root of 181118 is about 425.5796047745. The cubic root of 181118 is about 56.5788181299.

Adding to 181118 its reverse (811181), we get a palindrome (992299).

The spelling of 181118 in words is "one hundred eighty-one thousand, one hundred eighteen".