81750443041 has 2 divisors, whose sum is σ = 81750443042. Its totient is φ = 81750443040.

The previous prime is 81750443023. The next prime is 81750443083. The reversal of 81750443041 is 14034405718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56308917025 + 25441526016 = 237295^2 + 159504^2 .

It is a cyclic number.

It is not a de Polignac number, because 81750443041 - 2¹⁹ = 81749918753 is a prime.

It is a super-3 number, since 3×81750443041³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (81750443141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40875221520 + 40875221521.

It is an arithmetic number, because the mean of its divisors is an integer number (40875221521).

Almost surely, 2^81750443041 is an apocalyptic number.

It is an amenable number.

81750443041 is a deficient number, since it is larger than the sum of its proper divisors (1).

81750443041 is an equidigital number, since it uses as much as digits as its factorization.

81750443041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 37.

Adding to 81750443041 its reverse (14034405718), we get a palindrome (95784848759).

The spelling of 81750443041 in words is "eighty-one billion, seven hundred fifty million, four hundred forty-three thousand, forty-one".