81259 has 4 divisors (see below), whose sum is σ = 84816. Its totient is φ = 77704.

The previous prime is 81239. The next prime is 81281. The reversal of 81259 is 95218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95218 = 2 ⋅47609.

It is a cyclic number.

It is not a de Polignac number, because 81259 - 2⁷ = 81131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1744 + ... + 1789.

It is an arithmetic number, because the mean of its divisors is an integer number (21204).

2⁸¹²⁵⁹ is an apocalyptic number.

81259 is a deficient number, since it is larger than the sum of its proper divisors (3557).

81259 is a wasteful number, since it uses less digits than its factorization.

81259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3556.

The product of its digits is 720, while the sum is 25.

The square root of 81259 is about 285.0596428820. The cubic root of 81259 is about 43.3135544187.

The spelling of 81259 in words is "eighty-one thousand, two hundred fifty-nine".