159909 has 8 divisors (see below), whose sum is σ = 215232. Its totient is φ = 105600.

The previous prime is 159899. The next prime is 159911. The reversal of 159909 is 909951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 159909 - 2¹³ = 151717 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 159909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277 + ... + 629.

It is an arithmetic number, because the mean of its divisors is an integer number (26904).

2¹⁵⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

159909 is a deficient number, since it is larger than the sum of its proper divisors (55323).

159909 is a wasteful number, since it uses less digits than its factorization.

159909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507.

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

The square root of 159909 is about 399.8862338216. The cubic root of 159909 is about 54.2780582133.

The spelling of 159909 in words is "one hundred fifty-nine thousand, nine hundred nine".