99999565 has 16 divisors (see below), whose sum is σ = 126561600. Its totient is φ = 75641472.

The previous prime is 99999563. The next prime is 99999587. The reversal of 99999565 is 56599999.

It is a cyclic number.

It is not a de Polignac number, because 99999565 - 2¹ = 99999563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96289 + ... + 97321.

It is an arithmetic number, because the mean of its divisors is an integer number (7910100).

Almost surely, 2^99999565 is an apocalyptic number.

99999565 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

99999565 is a deficient number, since it is larger than the sum of its proper divisors (26562035).

99999565 is a wasteful number, since it uses less digits than its factorization.

99999565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076.

The product of its digits is 8857350, while the sum is 61.

The square root of 99999565 is about 9999.9782499763. The cubic root of 99999565 is about 464.1582103299.

The spelling of 99999565 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred sixty-five".