181045 has 4 divisors (see below), whose sum is σ = 217260. Its totient is φ = 144832.

The previous prime is 181039. The next prime is 181061. The reversal of 181045 is 540181.

181045 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 47089 + 133956 = 217^2 + 366^2 .

It is a cyclic number.

It is not a de Polignac number, because 181045 - 2⁹ = 180533 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18100 + ... + 18109.

It is an arithmetic number, because the mean of its divisors is an integer number (54315).

2¹⁸¹⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

181045 is a deficient number, since it is larger than the sum of its proper divisors (36215).

181045 is an equidigital number, since it uses as much as digits as its factorization.

181045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36214.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 181045 is about 425.4938307426. The cubic root of 181045 is about 56.5712157036.

The spelling of 181045 in words is "one hundred eighty-one thousand, forty-five".