81044 has 6 divisors (see below), whose sum is σ = 141834. Its totient is φ = 40520.

The previous prime is 81043. The next prime is 81047. The reversal of 81044 is 44018.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 44944 + 36100 = 212^2 + 190^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10127 + ... + 10134.

It is an arithmetic number, because the mean of its divisors is an integer number (23639).

2⁸¹⁰⁴⁴ is an apocalyptic number.

It is an amenable number.

81044 is a deficient number, since it is larger than the sum of its proper divisors (60790).

81044 is a wasteful number, since it uses less digits than its factorization.

81044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20265 (or 20263 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 81044 is about 284.6822790410. The cubic root of 81044 is about 43.2753201332.

The spelling of 81044 in words is "eighty-one thousand, forty-four".