159391 has 4 divisors (see below), whose sum is σ = 167800. Its totient is φ = 150984.

The previous prime is 159389. The next prime is 159403. The reversal of 159391 is 193951.

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 159391 - 2¹ = 159389 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159311) 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, 4176 + ... + 4213.

It is an arithmetic number, because the mean of its divisors is an integer number (41950).

2¹⁵⁹³⁹¹ is an apocalyptic number.

159391 is the 253-rd centered pentagonal number and also the 231-st hex number.

159391 is a deficient number, since it is larger than the sum of its proper divisors (8409).

159391 is an equidigital number, since it uses as much as digits as its factorization.

159391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8408.

The product of its digits is 1215, while the sum is 28.

The square root of 159391 is about 399.2380242412. The cubic root of 159391 is about 54.2193864102.

The spelling of 159391 in words is "one hundred fifty-nine thousand, three hundred ninety-one".