999159 has 16 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 570360.

The previous prime is 999149. The next prime is 999169. The reversal of 999159 is 951999.

It is an interprime number because it is at equal distance from previous prime (999149) and next prime (999169).

It is not a de Polignac number, because 999159 - 2¹¹ = 997111 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 999159.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999159.

It is not an unprimeable number, because it can be changed into a prime (999149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 544 + ... + 1514.

It is an arithmetic number, because the mean of its divisors is an integer number (97200).

2⁹⁹⁹¹⁵⁹ is an apocalyptic number.

999159 is a deficient number, since it is larger than the sum of its proper divisors (556041).

999159 is an equidigital number, since it uses as much as digits as its factorization.

999159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995 (or 981 counting only the distinct ones).

The product of its digits is 32805, while the sum is 42.

The square root of 999159 is about 999.5794115527. The cubic root of 999159 is about 99.9719588043.

The spelling of 999159 in words is "nine hundred ninety-nine thousand, one hundred fifty-nine".