81740041 has 2 divisors, whose sum is σ = 81740042. Its totient is φ = 81740040.

The previous prime is 81740027. The next prime is 81740053. The reversal of 81740041 is 14004718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43560000 + 38180041 = 6600^2 + 6179^2 .

It is a cyclic number.

It is not a de Polignac number, because 81740041 - 2¹³ = 81731849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81739988 and 81740015.

It is not a weakly prime, because it can be changed into another prime (81740011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40870020 + 40870021.

It is an arithmetic number, because the mean of its divisors is an integer number (40870021).

Almost surely, 2^81740041 is an apocalyptic number.

It is an amenable number.

81740041 is a deficient number, since it is larger than the sum of its proper divisors (1).

81740041 is an equidigital number, since it uses as much as digits as its factorization.

81740041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 81740041 is about 9041.0199092801. The cubic root of 81740041 is about 433.9885621371.

Adding to 81740041 its reverse (14004718), we get a palindrome (95744759).

The spelling of 81740041 in words is "eighty-one million, seven hundred forty thousand, forty-one".