161181188 has 48 divisors (see below), whose sum is σ = 340368000. Its totient is φ = 66679200.

The previous prime is 161181187. The next prime is 161181193. The reversal of 161181188 is 881181161.

It is not an unprimeable number, because it can be changed into a prime (161181187) 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, 37763 + ... + 41813.

It is an arithmetic number, because the mean of its divisors is an integer number (7091000).

Almost surely, 2^161181188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161181188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170184000).

161181188 is an abundant number, since it is smaller than the sum of its proper divisors (179186812).

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

161181188 is a wasteful number, since it uses less digits than its factorization.

161181188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105 (or 4089 counting only the distinct ones).

The product of its digits is 3072, while the sum is 35.

The square root of 161181188 is about 12695.7153402240. The cubic root of 161181188 is about 544.2161815609.

The spelling of 161181188 in words is "one hundred sixty-one million, one hundred eighty-one thousand, one hundred eighty-eight".