191565 has 40 divisors (see below), whose sum is σ = 383328. Its totient is φ = 90720.

The previous prime is 191563. The next prime is 191579. The reversal of 191565 is 565191.

191565 is an admirable number.

It is not a de Polignac number, because 191565 - 2¹ = 191563 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191561) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4434 + ... + 4476.

2¹⁹¹⁵⁶⁵ is an apocalyptic number.

191565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191565 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191565 is a wasteful number, since it uses less digits than its factorization.

191565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 62 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 191565 is about 437.6813909684. The cubic root of 191565 is about 57.6463819122.

The spelling of 191565 in words is "one hundred ninety-one thousand, five hundred sixty-five".