81038 has 4 divisors (see below), whose sum is σ = 121560. Its totient is φ = 40518.

The previous prime is 81031. The next prime is 81041. The reversal of 81038 is 83018.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81031) by changing a digit.

81038 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20258 + ... + 20261.

It is an arithmetic number, because the mean of its divisors is an integer number (30390).

2⁸¹⁰³⁸ is an apocalyptic number.

81038 is a deficient number, since it is larger than the sum of its proper divisors (40522).

81038 is a wasteful number, since it uses less digits than its factorization.

81038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40521.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 81038 is about 284.6717407823. The cubic root of 81038 is about 43.2742521605.

Subtracting from 81038 its sum of digits (20), we obtain a palindrome (81018).

It can be divided in two parts, 810 and 38, that added together give a palindrome (848).

The spelling of 81038 in words is "eighty-one thousand, thirty-eight".