84543813 has 6 divisors (see below), whose sum is σ = 122118854. Its totient is φ = 56362536.

The previous prime is 84543799. The next prime is 84543821. The reversal of 84543813 is 31834548.

It can be written as a sum of positive squares in only one way, i.e., 79602084 + 4941729 = 8922^2 + 2223^2 .

It is not a de Polignac number, because 84543813 - 2¹⁰ = 84542789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84543013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4696870 + ... + 4696887.

Almost surely, 2^84543813 is an apocalyptic number.

It is an amenable number.

84543813 is a deficient number, since it is larger than the sum of its proper divisors (37575041).

84543813 is a wasteful number, since it uses less digits than its factorization.

84543813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9393763 (or 9393760 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 84543813 is about 9194.7709596270. The cubic root of 84543813 is about 438.8949768055.

The spelling of 84543813 in words is "eighty-four million, five hundred forty-three thousand, eight hundred thirteen".