6989867791 has 2 divisors, whose sum is σ = 6989867792. Its totient is φ = 6989867790.

The previous prime is 6989867779. The next prime is 6989867867. The reversal of 6989867791 is 1977689896.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6989867791 - 2⁷ = 6989867663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6989867791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6989867771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494933895 + 3494933896.

It is an arithmetic number, because the mean of its divisors is an integer number (3494933896).

Almost surely, 2^6989867791 is an apocalyptic number.

6989867791 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989867791 is an equidigital number, since it uses as much as digits as its factorization.

6989867791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82301184, while the sum is 70.

The square root of 6989867791 is about 83605.4291957167. The cubic root of 6989867791 is about 1912.0077743093.

The spelling of 6989867791 in words is "six billion, nine hundred eighty-nine million, eight hundred sixty-seven thousand, seven hundred ninety-one".