159881 has 4 divisors (see below), whose sum is σ = 162564. Its totient is φ = 157200.

The previous prime is 159871. The next prime is 159899. The reversal of 159881 is 188951.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188951 = 7 ⋅26993.

It can be written as a sum of positive squares in 2 ways, for example, as 60025 + 99856 = 245^2 + 316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159881 is a prime.

It is a super-2 number, since 2×159881² = 51123868322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (159811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250 + ... + 1371.

It is an arithmetic number, because the mean of its divisors is an integer number (40641).

2¹⁵⁹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

159881 is a deficient number, since it is larger than the sum of its proper divisors (2683).

159881 is an equidigital number, since it uses as much as digits as its factorization.

159881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682.

The product of its digits is 2880, while the sum is 32.

The square root of 159881 is about 399.8512223315. The cubic root of 159881 is about 54.2748900065.

The spelling of 159881 in words is "one hundred fifty-nine thousand, eight hundred eighty-one".