181145 has 4 divisors (see below), whose sum is σ = 217380. Its totient is φ = 144912.

The previous prime is 181141. The next prime is 181157. The reversal of 181145 is 541181.

181145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80656 + 100489 = 284^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 181145 - 2² = 181141 is a prime.

It is a super-2 number, since 2×181145² = 65627022050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (181141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18110 + ... + 18119.

It is an arithmetic number, because the mean of its divisors is an integer number (54345).

2¹⁸¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

181145 is a deficient number, since it is larger than the sum of its proper divisors (36235).

181145 is an equidigital number, since it uses as much as digits as its factorization.

181145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36234.

The product of its digits is 160, while the sum is 20.

The square root of 181145 is about 425.6113250373. The cubic root of 181145 is about 56.5816294687.

The spelling of 181145 in words is "one hundred eighty-one thousand, one hundred forty-five".