85881 has 4 divisors (see below), whose sum is σ = 114512. Its totient is φ = 57252.

The previous prime is 85853. The next prime is 85889. The reversal of 85881 is 18858.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 85881 - 2⁶ = 85817 is a prime.

It is a super-2 number, since 2×85881² = 14751092322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 85881.

It is not an unprimeable number, because it can be changed into a prime (85889) 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, 14311 + ... + 14316.

It is an arithmetic number, because the mean of its divisors is an integer number (28628).

2⁸⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

85881 is a deficient number, since it is larger than the sum of its proper divisors (28631).

85881 is a wasteful number, since it uses less digits than its factorization.

85881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28630.

The product of its digits is 2560, while the sum is 30.

The square root of 85881 is about 293.0546024208. The cubic root of 85881 is about 44.1196810566.

It can be divided in two parts, 858 and 81, that added together give a palindrome (939).

The spelling of 85881 in words is "eighty-five thousand, eight hundred eighty-one".