181085 has 4 divisors (see below), whose sum is σ = 217308. Its totient is φ = 144864.

The previous prime is 181081. The next prime is 181087. The reversal of 181085 is 580181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 580181 = 7 ⋅82883.

It can be written as a sum of positive squares in 2 ways, for example, as 41209 + 139876 = 203^2 + 374^2 .

It is a cyclic number.

It is not a de Polignac number, because 181085 - 2² = 181081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181085.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 181085.

It is not an unprimeable number, because it can be changed into a prime (181081) 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, 18104 + ... + 18113.

It is an arithmetic number, because the mean of its divisors is an integer number (54327).

2¹⁸¹⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

181085 is a deficient number, since it is larger than the sum of its proper divisors (36223).

181085 is an equidigital number, since it uses as much as digits as its factorization.

181085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36222.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 181085 is about 425.5408323534. The cubic root of 181085 is about 56.5753816697.

The spelling of 181085 in words is "one hundred eighty-one thousand, eighty-five".