8621813009 has 2 divisors, whose sum is σ = 8621813010. Its totient is φ = 8621813008.

The previous prime is 8621812993. The next prime is 8621813021. The reversal of 8621813009 is 9003181268.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5421082384 + 3200730625 = 73628^2 + 56575^2 .

It is a cyclic number.

It is not a de Polignac number, because 8621813009 - 2⁴ = 8621812993 is a prime.

It is not a weakly prime, because it can be changed into another prime (8621813029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4310906504 + 4310906505.

It is an arithmetic number, because the mean of its divisors is an integer number (4310906505).

Almost surely, 2^8621813009 is an apocalyptic number.

It is an amenable number.

8621813009 is a deficient number, since it is larger than the sum of its proper divisors (1).

8621813009 is an equidigital number, since it uses as much as digits as its factorization.

8621813009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 8621813009 is about 92853.7183369627. The cubic root of 8621813009 is about 2050.5303413912.

The spelling of 8621813009 in words is "eight billion, six hundred twenty-one million, eight hundred thirteen thousand, nine".