191365 has 4 divisors (see below), whose sum is σ = 229644. Its totient is φ = 153088.

The previous prime is 191353. The next prime is 191413. The reversal of 191365 is 563191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 563191 = 79 ⋅7129.

It can be written as a sum of positive squares in 2 ways, for example, as 125316 + 66049 = 354^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 191365 - 2⁷ = 191237 is a prime.

It is a Duffinian number.

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, 19132 + ... + 19141.

It is an arithmetic number, because the mean of its divisors is an integer number (57411).

2¹⁹¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

191365 is a deficient number, since it is larger than the sum of its proper divisors (38279).

191365 is an equidigital number, since it uses as much as digits as its factorization.

191365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38278.

The product of its digits is 810, while the sum is 25.

The square root of 191365 is about 437.4528546026. The cubic root of 191365 is about 57.6263133697.

The spelling of 191365 in words is "one hundred ninety-one thousand, three hundred sixty-five".