81984017 has 2 divisors, whose sum is σ = 81984018. Its totient is φ = 81984016.

The previous prime is 81984011. The next prime is 81984059. The reversal of 81984017 is 71048918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41011216 + 40972801 = 6404^2 + 6401^2 .

It is a cyclic number.

It is not a de Polignac number, because 81984017 - 2⁸ = 81983761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81984011) 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, 40992008 + 40992009.

It is an arithmetic number, because the mean of its divisors is an integer number (40992009).

Almost surely, 2^81984017 is an apocalyptic number.

It is an amenable number.

81984017 is a deficient number, since it is larger than the sum of its proper divisors (1).

81984017 is an equidigital number, since it uses as much as digits as its factorization.

81984017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 81984017 is about 9054.5025815889. The cubic root of 81984017 is about 434.4199199754.

The spelling of 81984017 in words is "eighty-one million, nine hundred eighty-four thousand, seventeen".