999999165 has 32 divisors (see below), whose sum is σ = 1837324800. Its totient is φ = 459328320.

The previous prime is 999999163. The next prime is 999999181. The reversal of 999999165 is 561999999.

It is not a de Polignac number, because 999999165 - 2¹ = 999999163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999999096 and 999999105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999163) 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 31 ways as a sum of consecutive naturals, for example, 156355 + ... + 162624.

It is an arithmetic number, because the mean of its divisors is an integer number (57416400).

Almost surely, 2^999999165 is an apocalyptic number.

999999165 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

999999165 is a deficient number, since it is larger than the sum of its proper divisors (837325635).

999999165 is a wasteful number, since it uses less digits than its factorization.

999999165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319017.

The product of its digits is 15943230, while the sum is 66.

The square root of 999999165 is about 31622.7633991718. The cubic root of 999999165 is about 999.9997216666. Note that the first 3 decimals are identical.

The spelling of 999999165 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, one hundred sixty-five".