9647078809 has 2 divisors, whose sum is σ = 9647078810. Its totient is φ = 9647078808.

The previous prime is 9647078737. The next prime is 9647078863. The reversal of 9647078809 is 9088707469.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6292931584 + 3354147225 = 79328^2 + 57915^2 .

It is a cyclic number.

It is not a de Polignac number, because 9647078809 - 2¹⁵ = 9647046041 is a prime.

It is a super-2 number, since 2×9647078809² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9647078869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4823539404 + 4823539405.

It is an arithmetic number, because the mean of its divisors is an integer number (4823539405).

Almost surely, 2^9647078809 is an apocalyptic number.

It is an amenable number.

9647078809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9647078809 is an equidigital number, since it uses as much as digits as its factorization.

9647078809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The square root of 9647078809 is about 98219.5439258399. The cubic root of 9647078809 is about 2128.7856898191.

The spelling of 9647078809 in words is "nine billion, six hundred forty-seven million, seventy-eight thousand, eight hundred nine".