161118 has 12 divisors (see below), whose sum is σ = 349128. Its totient is φ = 53700.

The previous prime is 161093. The next prime is 161123. The reversal of 161118 is 811161.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 8951 = 161118 / (1 + 6 + 1 + 1 + 1 + 8).

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 161118.

It is a congruent number.

It is an unprimeable number.

161118 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 5 ways as a sum of consecutive naturals, for example, 4458 + ... + 4493.

It is an arithmetic number, because the mean of its divisors is an integer number (29094).

2¹⁶¹¹¹⁸ is an apocalyptic number.

161118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161118 is an abundant number, since it is smaller than the sum of its proper divisors (188010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161118 is a wasteful number, since it uses less digits than its factorization.

161118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8959 (or 8956 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

The square root of 161118 is about 401.3950672343. The cubic root of 161118 is about 54.4145055753.

Adding to 161118 its reverse (811161), we get a palindrome (972279).

The spelling of 161118 in words is "one hundred sixty-one thousand, one hundred eighteen".