81116 has 12 divisors (see below), whose sum is σ = 162288. Its totient is φ = 34752.

The previous prime is 81101. The next prime is 81119. The reversal of 81116 is 61118.

It is a happy number.

81116 is an admirable number.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 81094 and 81103.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81116.

It is not an unprimeable number, because it can be changed into a prime (81119) 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, 1421 + ... + 1476.

It is an arithmetic number, because the mean of its divisors is an integer number (13524).

2⁸¹¹¹⁶ is an apocalyptic number.

It is an amenable number.

81116 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81144).

81116 is a wasteful number, since it uses less digits than its factorization.

81116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2908 (or 2906 counting only the distinct ones).

The product of its digits is 48, while the sum is 17.

The square root of 81116 is about 284.8087077320. The cubic root of 81116 is about 43.2881316956.

The spelling of 81116 in words is "eighty-one thousand, one hundred sixteen".