81941 has 4 divisors (see below), whose sum is σ = 83232. Its totient is φ = 80652.

The previous prime is 81937. The next prime is 81943. The reversal of 81941 is 14918.

81941 is nontrivially palindromic in base 13.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14918 = 2 ⋅7459.

It is a cyclic number.

It is not a de Polignac number, because 81941 - 2² = 81937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 4.

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 81941.

It is not an unprimeable number, because it can be changed into a prime (81943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545 + ... + 678.

It is an arithmetic number, because the mean of its divisors is an integer number (20808).

2⁸¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

81941 is a deficient number, since it is larger than the sum of its proper divisors (1291).

81941 is a wasteful number, since it uses less digits than its factorization.

81941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290.

The product of its digits is 288, while the sum is 23.

The square root of 81941 is about 286.2533842595. The cubic root of 81941 is about 43.4343926663.

Subtracting from 81941 its sum of digits (23), we obtain a palindrome (81918).

The spelling of 81941 in words is "eighty-one thousand, nine hundred forty-one".