159865 has 4 divisors (see below), whose sum is σ = 191844. Its totient is φ = 127888.

The previous prime is 159857. The next prime is 159869. The reversal of 159865 is 568951.

159865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114921 + 44944 = 339^2 + 212^2 .

It is a cyclic number.

It is not a de Polignac number, because 159865 - 2³ = 159857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 159865.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159869) 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, 15982 + ... + 15991.

It is an arithmetic number, because the mean of its divisors is an integer number (47961).

2¹⁵⁹⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

159865 is a deficient number, since it is larger than the sum of its proper divisors (31979).

159865 is an equidigital number, since it uses as much as digits as its factorization.

159865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31978.

The product of its digits is 10800, while the sum is 34.

The square root of 159865 is about 399.8312143893. The cubic root of 159865 is about 54.2730794365.

It can be divided in two parts, 159 and 865, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 159865 in words is "one hundred fifty-nine thousand, eight hundred sixty-five".