84543281813 has 2 divisors, whose sum is σ = 84543281814. Its totient is φ = 84543281812.

The previous prime is 84543281807. The next prime is 84543281821. The reversal of 84543281813 is 31818234548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42558452209 + 41984829604 = 206297^2 + 204902^2 .

It is a cyclic number.

It is not a de Polignac number, because 84543281813 - 2⁶ = 84543281749 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84543281843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42271640906 + 42271640907.

It is an arithmetic number, because the mean of its divisors is an integer number (42271640907).

Almost surely, 2^84543281813 is an apocalyptic number.

It is an amenable number.

84543281813 is a deficient number, since it is larger than the sum of its proper divisors (1).

84543281813 is an equidigital number, since it uses as much as digits as its factorization.

84543281813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 737280, while the sum is 47.

The spelling of 84543281813 in words is "eighty-four billion, five hundred forty-three million, two hundred eighty-one thousand, eight hundred thirteen".