159891 has 8 divisors (see below), whose sum is σ = 215040. Its totient is φ = 105672.

The previous prime is 159871. The next prime is 159899. The reversal of 159891 is 198951.

159891 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

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

It is not a de Polignac number, because 159891 - 2⁷ = 159763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (159899) 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, 550 + ... + 788.

It is an arithmetic number, because the mean of its divisors is an integer number (26880).

2¹⁵⁹⁸⁹¹ is an apocalyptic number.

159891 is a deficient number, since it is larger than the sum of its proper divisors (55149).

159891 is a wasteful number, since it uses less digits than its factorization.

159891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465.

The product of its digits is 3240, while the sum is 33.

The square root of 159891 is about 399.8637267870. The cubic root of 159891 is about 54.2760215514.

Subtracting from 159891 its product of digits (3240), we obtain a palindrome (156651).

Subtracting 159891 from its reverse (198951), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 159891 in words is "one hundred fifty-nine thousand, eight hundred ninety-one".