181156 has 6 divisors (see below), whose sum is σ = 317030. Its totient is φ = 90576.

The previous prime is 181141. The next prime is 181157. The reversal of 181156 is 651181.

It can be written as a sum of positive squares in only one way, i.e., 173056 + 8100 = 416^2 + 90^2 .

It is not an unprimeable number, because it can be changed into a prime (181157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22641 + ... + 22648.

2¹⁸¹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

181156 is a deficient number, since it is larger than the sum of its proper divisors (135874).

181156 is a wasteful number, since it uses less digits than its factorization.

181156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45293 (or 45291 counting only the distinct ones).

The product of its digits is 240, while the sum is 22.

The square root of 181156 is about 425.6242474296. The cubic root of 181156 is about 56.5827747489.

The spelling of 181156 in words is "one hundred eighty-one thousand, one hundred fifty-six".