990159 has 4 divisors (see below), whose sum is σ = 1320216. Its totient is φ = 660104.

The previous prime is 990151. The next prime is 990163. The reversal of 990159 is 951099.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 990159 - 2³ = 990151 is a prime.

It is a D-number.

990159 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990151) 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, 165024 + ... + 165029.

It is an arithmetic number, because the mean of its divisors is an integer number (330054).

2⁹⁹⁰¹⁵⁹ is an apocalyptic number.

990159 is a deficient number, since it is larger than the sum of its proper divisors (330057).

990159 is a wasteful number, since it uses less digits than its factorization.

990159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330056.

The product of its (nonzero) digits is 3645, while the sum is 33.

The square root of 990159 is about 995.0673344051. The cubic root of 990159 is about 99.6708846861.

Subtracting from 990159 its reverse (951099), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 990159 in words is "nine hundred ninety thousand, one hundred fifty-nine".