8709238561 has 2 divisors, whose sum is σ = 8709238562. Its totient is φ = 8709238560.

The previous prime is 8709238541. The next prime is 8709238609. The reversal of 8709238561 is 1658329078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4462240000 + 4246998561 = 66800^2 + 65169^2 .

It is a cyclic number.

It is not a de Polignac number, because 8709238561 - 2⁵ = 8709238529 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (8709238541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4354619280 + 4354619281.

It is an arithmetic number, because the mean of its divisors is an integer number (4354619281).

Almost surely, 2^8709238561 is an apocalyptic number.

It is an amenable number.

8709238561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8709238561 is an equidigital number, since it uses as much as digits as its factorization.

8709238561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 8709238561 is about 93323.3012757264. The cubic root of 8709238561 is about 2057.4378679330.

The spelling of 8709238561 in words is "eight billion, seven hundred nine million, two hundred thirty-eight thousand, five hundred sixty-one".