81282841 has 2 divisors, whose sum is σ = 81282842. Its totient is φ = 81282840.

The previous prime is 81282829. The next prime is 81282907. The reversal of 81282841 is 14828218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78057225 + 3225616 = 8835^2 + 1796^2 .

It is a cyclic number.

It is not a de Polignac number, because 81282841 - 2⁵ = 81282809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81282797 and 81282806.

It is not a weakly prime, because it can be changed into another prime (81283841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40641420 + 40641421.

It is an arithmetic number, because the mean of its divisors is an integer number (40641421).

Almost surely, 2^81282841 is an apocalyptic number.

It is an amenable number.

81282841 is a deficient number, since it is larger than the sum of its proper divisors (1).

81282841 is an equidigital number, since it uses as much as digits as its factorization.

81282841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8192, while the sum is 34.

The square root of 81282841 is about 9015.6996955311. The cubic root of 81282841 is about 433.1779000067.

The spelling of 81282841 in words is "eighty-one million, two hundred eighty-two thousand, eight hundred forty-one".