8720846509 has 2 divisors, whose sum is σ = 8720846510. Its totient is φ = 8720846508.

The previous prime is 8720846483. The next prime is 8720846587. The reversal of 8720846509 is 9056480278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4361942025 + 4358904484 = 66045^2 + 66022^2 .

It is a cyclic number.

It is not a de Polignac number, because 8720846509 - 2¹⁵ = 8720813741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8720846209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360423254 + 4360423255.

It is an arithmetic number, because the mean of its divisors is an integer number (4360423255).

Almost surely, 2^8720846509 is an apocalyptic number.

It is an amenable number.

8720846509 is a deficient number, since it is larger than the sum of its proper divisors (1).

8720846509 is an equidigital number, since it uses as much as digits as its factorization.

8720846509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 49.

The square root of 8720846509 is about 93385.4726871369. The cubic root of 8720846509 is about 2058.3515348381.

The spelling of 8720846509 in words is "eight billion, seven hundred twenty million, eight hundred forty-six thousand, five hundred nine".