159581 has 8 divisors (see below), whose sum is σ = 173280. Its totient is φ = 146448.

The previous prime is 159571. The next prime is 159589. The reversal of 159581 is 185951.

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

It is a cyclic number.

It is not a de Polignac number, because 159581 - 2¹⁴ = 143197 is a prime.

It is a super-2 number, since 2×159581² = 50932191122, which contains 22 as substring.

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 (159589) 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, 590 + ... + 816.

It is an arithmetic number, because the mean of its divisors is an integer number (21660).

2¹⁵⁹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

159581 is a deficient number, since it is larger than the sum of its proper divisors (13699).

159581 is a wasteful number, since it uses less digits than its factorization.

159581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283.

The product of its digits is 1800, while the sum is 29.

The square root of 159581 is about 399.4759066577. The cubic root of 159581 is about 54.2409216972.

The spelling of 159581 in words is "one hundred fifty-nine thousand, five hundred eighty-one".