7971600809 has 2 divisors, whose sum is σ = 7971600810. Its totient is φ = 7971600808.

The previous prime is 7971600799. The next prime is 7971600817. The reversal of 7971600809 is 9080061797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7963777600 + 7823209 = 89240^2 + 2797^2 .

It is an emirp because it is prime and its reverse (9080061797) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7971600809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7971600209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3985800404 + 3985800405.

It is an arithmetic number, because the mean of its divisors is an integer number (3985800405).

Almost surely, 2^7971600809 is an apocalyptic number.

It is an amenable number.

7971600809 is a deficient number, since it is larger than the sum of its proper divisors (1).

7971600809 is an equidigital number, since it uses as much as digits as its factorization.

7971600809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 7971600809 is about 89283.8216531976. The cubic root of 7971600809 is about 1997.6305948180.

The spelling of 7971600809 in words is "seven billion, nine hundred seventy-one million, six hundred thousand, eight hundred nine".