8521928609 has 2 divisors, whose sum is σ = 8521928610. Its totient is φ = 8521928608.

The previous prime is 8521928599. The next prime is 8521928663. The reversal of 8521928609 is 9068291258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8220142225 + 301786384 = 90665^2 + 17372^2 .

It is a cyclic number.

It is not a de Polignac number, because 8521928609 - 2¹⁶ = 8521863073 is a prime.

It is not a weakly prime, because it can be changed into another prime (8521928809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260964304 + 4260964305.

It is an arithmetic number, because the mean of its divisors is an integer number (4260964305).

Almost surely, 2^8521928609 is an apocalyptic number.

It is an amenable number.

8521928609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521928609 is an equidigital number, since it uses as much as digits as its factorization.

8521928609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 8521928609 is about 92314.2925499622. The cubic root of 8521928609 is about 2042.5810442821.

The spelling of 8521928609 in words is "eight billion, five hundred twenty-one million, nine hundred twenty-eight thousand, six hundred nine".