8391843317 has 12 divisors (see below), whose sum is σ = 9933639660. Its totient is φ = 7042104960.

The previous prime is 8391843307. The next prime is 8391843391. The reversal of 8391843317 is 7133481938.

It can be written as a sum of positive squares in 2 ways, for example, as 5301150481 + 3090692836 = 72809^2 + 55594^2 .

It is a de Polignac number, because none of the positive numbers 2^k-8391843317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8391843307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2665892 + ... + 2669037.

It is an arithmetic number, because the mean of its divisors is an integer number (827803305).

Almost surely, 2^8391843317 is an apocalyptic number.

It is an amenable number.

8391843317 is a deficient number, since it is larger than the sum of its proper divisors (1541796343).

8391843317 is a wasteful number, since it uses less digits than its factorization.

8391843317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5334964 (or 5334953 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 8391843317 is about 91607.0047376291. The cubic root of 8391843317 is about 2032.1345304741.

The spelling of 8391843317 in words is "eight billion, three hundred ninety-one million, eight hundred forty-three thousand, three hundred seventeen".