99565 has 4 divisors (see below), whose sum is σ = 119484. Its totient is φ = 79648.

The previous prime is 99563. The next prime is 99571. The reversal of 99565 is 56599.

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 14884 + 84681 = 122^2 + 291^2 .

It is a cyclic number.

It is not a de Polignac number, because 99565 - 2¹ = 99563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99563) 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, 9952 + ... + 9961.

It is an arithmetic number, because the mean of its divisors is an integer number (29871).

2⁹⁹⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

99565 is a deficient number, since it is larger than the sum of its proper divisors (19919).

99565 is a wasteful number, since it uses less digits than its factorization.

99565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19918.

The product of its digits is 12150, while the sum is 34.

The square root of 99565 is about 315.5392210170. The cubic root of 99565 is about 46.3484874721.

Adding to 99565 its sum of digits (34), we get a palindrome (99599).

The spelling of 99565 in words is "ninety-nine thousand, five hundred sixty-five".