81159 has 8 divisors (see below), whose sum is σ = 116592. Its totient is φ = 49920.

The previous prime is 81157. The next prime is 81163. The reversal of 81159 is 95118.

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

It is not a de Polignac number, because 81159 - 2¹ = 81157 is a prime.

It is a super-4 number, since 4×81159⁴ (a number of 21 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81157) 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, 1002 + ... + 1079.

It is an arithmetic number, because the mean of its divisors is an integer number (14574).

2⁸¹¹⁵⁹ is an apocalyptic number.

81159 is a deficient number, since it is larger than the sum of its proper divisors (35433).

81159 is a wasteful number, since it uses less digits than its factorization.

81159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097.

The product of its digits is 360, while the sum is 24.

The square root of 81159 is about 284.8841869953. The cubic root of 81159 is about 43.2957794299.

The spelling of 81159 in words is "eighty-one thousand, one hundred fifty-nine".