6789718391 has 2 divisors, whose sum is σ = 6789718392. Its totient is φ = 6789718390.

The previous prime is 6789718291. The next prime is 6789718423. The reversal of 6789718391 is 1938179876.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6789718391 is a prime.

It is a super-3 number, since 3×6789718391³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 6789718391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6789718291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3394859195 + 3394859196.

It is an arithmetic number, because the mean of its divisors is an integer number (3394859196).

Almost surely, 2^6789718391 is an apocalyptic number.

6789718391 is a deficient number, since it is larger than the sum of its proper divisors (1).

6789718391 is an equidigital number, since it uses as much as digits as its factorization.

6789718391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 59.

The square root of 6789718391 is about 82399.7475178171. The cubic root of 6789718391 is about 1893.5811455048.

The spelling of 6789718391 in words is "six billion, seven hundred eighty-nine million, seven hundred eighteen thousand, three hundred ninety-one".