8720509073 has 2 divisors, whose sum is σ = 8720509074. Its totient is φ = 8720509072.

The previous prime is 8720509051. The next prime is 8720509093. The reversal of 8720509073 is 3709050278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5039296144 + 3681212929 = 70988^2 + 60673^2 .

It is a cyclic number.

It is not a de Polignac number, because 8720509073 - 2¹⁴ = 8720492689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8720509073.

It is not a weakly prime, because it can be changed into another prime (8720509043) 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, 4360254536 + 4360254537.

It is an arithmetic number, because the mean of its divisors is an integer number (4360254537).

Almost surely, 2^8720509073 is an apocalyptic number.

It is an amenable number.

8720509073 is a deficient number, since it is larger than the sum of its proper divisors (1).

8720509073 is an equidigital number, since it uses as much as digits as its factorization.

8720509073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 8720509073 is about 93383.6659860813. The cubic root of 8720509073 is about 2058.3249865412.

The spelling of 8720509073 in words is "eight billion, seven hundred twenty million, five hundred nine thousand, seventy-three".