84561817 has 2 divisors, whose sum is σ = 84561818. Its totient is φ = 84561816.

The previous prime is 84561797. The next prime is 84561847. The reversal of 84561817 is 71816548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76405081 + 8156736 = 8741^2 + 2856^2 .

It is a cyclic number.

It is not a de Polignac number, because 84561817 - 2¹⁹ = 84037529 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84561817.

It is not a weakly prime, because it can be changed into another prime (84561847) 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, 42280908 + 42280909.

It is an arithmetic number, because the mean of its divisors is an integer number (42280909).

Almost surely, 2^84561817 is an apocalyptic number.

It is an amenable number.

84561817 is a deficient number, since it is larger than the sum of its proper divisors (1).

84561817 is an equidigital number, since it uses as much as digits as its factorization.

84561817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 40.

The square root of 84561817 is about 9195.7499422287. The cubic root of 84561817 is about 438.9261295063.

The spelling of 84561817 in words is "eighty-four million, five hundred sixty-one thousand, eight hundred seventeen".