9809647873 has 2 divisors, whose sum is σ = 9809647874. Its totient is φ = 9809647872.

The previous prime is 9809647849. The next prime is 9809647877. The reversal of 9809647873 is 3787469089.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7050457089 + 2759190784 = 83967^2 + 52528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9809647873 is a prime.

It is not a weakly prime, because it can be changed into another prime (9809647877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4904823936 + 4904823937.

It is an arithmetic number, because the mean of its divisors is an integer number (4904823937).

Almost surely, 2^9809647873 is an apocalyptic number.

It is an amenable number.

9809647873 is a deficient number, since it is larger than the sum of its proper divisors (1).

9809647873 is an equidigital number, since it uses as much as digits as its factorization.

9809647873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18289152, while the sum is 61.

The square root of 9809647873 is about 99043.6664961470. Note that the first 3 decimals coincide. The cubic root of 9809647873 is about 2140.6769827327.

The spelling of 9809647873 in words is "nine billion, eight hundred nine million, six hundred forty-seven thousand, eight hundred seventy-three".