81041 has 2 divisors, whose sum is σ = 81042. Its totient is φ = 81040.

The previous prime is 81031. The next prime is 81043. The reversal of 81041 is 14018.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70225 + 10816 = 265^2 + 104^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81041 is a prime.

Together with 81043, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40520 + 40521.

It is an arithmetic number, because the mean of its divisors is an integer number (40521).

2⁸¹⁰⁴¹ is an apocalyptic number.

It is an amenable number.

81041 is a deficient number, since it is larger than the sum of its proper divisors (1).

81041 is an equidigital number, since it uses as much as digits as its factorization.

81041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 81041 is about 284.6770099604. The cubic root of 81041 is about 43.2747861534.

Adding to 81041 its reverse (14018), we get a palindrome (95059).

The spelling of 81041 in words is "eighty-one thousand, forty-one".