165185 has 4 divisors (see below), whose sum is σ = 198228. Its totient is φ = 132144.

The previous prime is 165181. The next prime is 165203. The reversal of 165185 is 581561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 581561 = 71 ⋅8191.

It can be written as a sum of positive squares in 2 ways, for example, as 18496 + 146689 = 136^2 + 383^2 .

It is a cyclic number.

It is not a de Polignac number, because 165185 - 2² = 165181 is a prime.

It is an Ulam number.

It is a Duffinian number.

165185 is a modest number, since divided by 185 gives 165 as remainder.

It is not an unprimeable number, because it can be changed into a prime (165181) 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, 16514 + ... + 16523.

It is an arithmetic number, because the mean of its divisors is an integer number (49557).

2¹⁶⁵¹⁸⁵ is an apocalyptic number.

It is an amenable number.

165185 is a deficient number, since it is larger than the sum of its proper divisors (33043).

165185 is an equidigital number, since it uses as much as digits as its factorization.

165185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33042.

The product of its digits is 1200, while the sum is 26.

The square root of 165185 is about 406.4295756955. The cubic root of 165185 is about 54.8685566399.

The spelling of 165185 in words is "one hundred sixty-five thousand, one hundred eighty-five".