8309439989717 has 2 divisors, whose sum is σ = 8309439989718. Its totient is φ = 8309439989716.

The previous prime is 8309439989603. The next prime is 8309439989759. The reversal of 8309439989717 is 7179899349038.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6857725863076 + 1451714126641 = 2618726^2 + 1204871^2 .

It is a cyclic number.

It is not a de Polignac number, because 8309439989717 - 2²² = 8309435795413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8309439989117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4154719994858 + 4154719994859.

It is an arithmetic number, because the mean of its divisors is an integer number (4154719994859).

Almost surely, 2^{8309439989717} is an apocalyptic number.

It is an amenable number.

8309439989717 is a deficient number, since it is larger than the sum of its proper divisors (1).

8309439989717 is an equidigital number, since it uses as much as digits as its factorization.

8309439989717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 740710656, while the sum is 77.

The spelling of 8309439989717 in words is "eight trillion, three hundred nine billion, four hundred thirty-nine million, nine hundred eighty-nine thousand, seven hundred seventeen".