181089065 has 4 divisors (see below), whose sum is σ = 217306884. Its totient is φ = 144871248.

The previous prime is 181089043. The next prime is 181089067. The reversal of 181089065 is 560980181.

181089065 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 95785369 + 85303696 = 9787^2 + 9236^2 .

It is a cyclic number.

It is not a de Polignac number, because 181089065 - 2¹⁰ = 181088041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181089067) 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, 18108902 + ... + 18108911.

It is an arithmetic number, because the mean of its divisors is an integer number (54326721).

Almost surely, 2^181089065 is an apocalyptic number.

It is an amenable number.

181089065 is a deficient number, since it is larger than the sum of its proper divisors (36217819).

181089065 is an equidigital number, since it uses as much as digits as its factorization.

181089065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36217818.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 181089065 is about 13456.9337146320. The cubic root of 181089065 is about 565.7580500168.

The spelling of 181089065 in words is "one hundred eighty-one million, eighty-nine thousand, sixty-five".