191165 has 16 divisors (see below), whose sum is σ = 263088. Its totient is φ = 132096.

The previous prime is 191161. The next prime is 191173. The reversal of 191165 is 561191.

It can be written as a sum of positive squares in 8 ways, for example, as 2809 + 188356 = 53^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 191165 - 2² = 191161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 191165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1019 + ... + 1191.

It is an arithmetic number, because the mean of its divisors is an integer number (16443).

2¹⁹¹¹⁶⁵ is an apocalyptic number.

It is an amenable number.

191165 is a deficient number, since it is larger than the sum of its proper divisors (71923).

191165 is a wasteful number, since it uses less digits than its factorization.

191165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208.

The product of its digits is 270, while the sum is 23.

The square root of 191165 is about 437.2241987814. The cubic root of 191165 is about 57.6062308396.

The spelling of 191165 in words is "one hundred ninety-one thousand, one hundred sixty-five".