159989 has 4 divisors (see below), whose sum is σ = 161280. Its totient is φ = 158700.

The previous prime is 159979. The next prime is 160001. The reversal of 159989 is 989951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 159989 - 2¹² = 155893 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 437 + ... + 714.

It is an arithmetic number, because the mean of its divisors is an integer number (40320).

2¹⁵⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

159989 is a deficient number, since it is larger than the sum of its proper divisors (1291).

159989 is a wasteful number, since it uses less digits than its factorization.

159989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290.

The product of its digits is 29160, while the sum is 41.

The square root of 159989 is about 399.9862497637. The cubic root of 159989 is about 54.2871081953.

It can be divided in two parts, 1599 and 89, that multiplied together give a triangular number (142311 = T₅₃₃).

The spelling of 159989 in words is "one hundred fifty-nine thousand, nine hundred eighty-nine".