8391340717 has 4 divisors (see below), whose sum is σ = 8392334940. Its totient is φ = 8390346496.

The previous prime is 8391340649. The next prime is 8391340721. The reversal of 8391340717 is 7170431938.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6551445481 + 1839895236 = 80941^2 + 42894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8391340717 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 (8391347717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484342 + ... + 501367.

It is an arithmetic number, because the mean of its divisors is an integer number (2098083735).

Almost surely, 2^8391340717 is an apocalyptic number.

It is an amenable number.

8391340717 is a deficient number, since it is larger than the sum of its proper divisors (994223).

8391340717 is an equidigital number, since it uses as much as digits as its factorization.

8391340717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994222.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 8391340717 is about 91604.2614565502. The cubic root of 8391340717 is about 2032.0939604759.

The spelling of 8391340717 in words is "eight billion, three hundred ninety-one million, three hundred forty thousand, seven hundred seventeen".