81360841 has 2 divisors, whose sum is σ = 81360842. Its totient is φ = 81360840.

The previous prime is 81360809. The next prime is 81360889. The reversal of 81360841 is 14806318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81360400 + 441 = 9020^2 + 21^2 .

It is a cyclic number.

It is not a de Polignac number, because 81360841 - 2⁵ = 81360809 is a prime.

It is not a weakly prime, because it can be changed into another prime (81360241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40680420 + 40680421.

It is an arithmetic number, because the mean of its divisors is an integer number (40680421).

Almost surely, 2^81360841 is an apocalyptic number.

It is an amenable number.

81360841 is a deficient number, since it is larger than the sum of its proper divisors (1).

81360841 is an equidigital number, since it uses as much as digits as its factorization.

81360841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 81360841 is about 9020.0244456431. The cubic root of 81360841 is about 433.3164166309.

The spelling of 81360841 in words is "eighty-one million, three hundred sixty thousand, eight hundred forty-one".