8391985079 has 2 divisors, whose sum is σ = 8391985080. Its totient is φ = 8391985078.

The previous prime is 8391984989. The next prime is 8391985087. The reversal of 8391985079 is 9705891938.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8391985079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8391981079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4195992539 + 4195992540.

It is an arithmetic number, because the mean of its divisors is an integer number (4195992540).

Almost surely, 2^8391985079 is an apocalyptic number.

8391985079 is a deficient number, since it is larger than the sum of its proper divisors (1).

8391985079 is an equidigital number, since it uses as much as digits as its factorization.

8391985079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 59.

The square root of 8391985079 is about 91607.7784852356. The cubic root of 8391985079 is about 2032.1459732455.

The spelling of 8391985079 in words is "eight billion, three hundred ninety-one million, nine hundred eighty-five thousand, seventy-nine".