6991769089 has 2 divisors, whose sum is σ = 6991769090. Its totient is φ = 6991769088.

The previous prime is 6991769087. The next prime is 6991769243. The reversal of 6991769089 is 9809671996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4676234689 + 2315534400 = 68383^2 + 48120^2 .

It is a cyclic number.

It is not a de Polignac number, because 6991769089 - 2¹ = 6991769087 is a prime.

Together with 6991769087, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6991769089.

It is not a weakly prime, because it can be changed into another prime (6991769087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495884544 + 3495884545.

It is an arithmetic number, because the mean of its divisors is an integer number (3495884545).

Almost surely, 2^6991769089 is an apocalyptic number.

It is an amenable number.

6991769089 is a deficient number, since it is larger than the sum of its proper divisors (1).

6991769089 is an equidigital number, since it uses as much as digits as its factorization.

6991769089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13226976, while the sum is 64.

The square root of 6991769089 is about 83616.7990836770. The cubic root of 6991769089 is about 1912.1811188849.

The spelling of 6991769089 in words is "six billion, nine hundred ninety-one million, seven hundred sixty-nine thousand, eighty-nine".