8320782391 has 2 divisors, whose sum is σ = 8320782392. Its totient is φ = 8320782390.

The previous prime is 8320782389. The next prime is 8320782401. The reversal of 8320782391 is 1932870238.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8320782391 - 2¹ = 8320782389 is a prime.

Together with 8320782389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8320782791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4160391195 + 4160391196.

It is an arithmetic number, because the mean of its divisors is an integer number (4160391196).

Almost surely, 2^8320782391 is an apocalyptic number.

8320782391 is a deficient number, since it is larger than the sum of its proper divisors (1).

8320782391 is an equidigital number, since it uses as much as digits as its factorization.

8320782391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 8320782391 is about 91218.3226714896. The cubic root of 8320782391 is about 2026.3823222199.

The spelling of 8320782391 in words is "eight billion, three hundred twenty million, seven hundred eighty-two thousand, three hundred ninety-one".