159381 has 8 divisors (see below), whose sum is σ = 236160. Its totient is φ = 106236.

The previous prime is 159361. The next prime is 159389. The reversal of 159381 is 183951.

It is not a de Polignac number, because 159381 - 2⁵ = 159349 is a prime.

It is a super-2 number, since 2×159381² = 50804606322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 5903 = 159381 / (1 + 5 + 9 + 3 + 8 + 1).

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 (159389) 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, 2925 + ... + 2978.

It is an arithmetic number, because the mean of its divisors is an integer number (29520).

2¹⁵⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

159381 is a deficient number, since it is larger than the sum of its proper divisors (76779).

159381 is an equidigital number, since it uses as much as digits as its factorization.

159381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5912 (or 5906 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 159381 is about 399.2255001876. The cubic root of 159381 is about 54.2182525001.

Adding to 159381 its product of digits (1080), we get a triangular number (160461 = T₅₆₆).

It can be divided in two parts, 15 and 9381, that multiplied together give a triangular number (140715 = T₅₃₀).

The spelling of 159381 in words is "one hundred fifty-nine thousand, three hundred eighty-one".