8978697691 has 2 divisors, whose sum is σ = 8978697692. Its totient is φ = 8978697690.

The previous prime is 8978697683. The next prime is 8978697709. The reversal of 8978697691 is 1967968798.

8978697691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8978697691 - 2³ = 8978697683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8978697691.

It is not a weakly prime, because it can be changed into another prime (8978697601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4489348845 + 4489348846.

It is an arithmetic number, because the mean of its divisors is an integer number (4489348846).

Almost surely, 2^8978697691 is an apocalyptic number.

8978697691 is a deficient number, since it is larger than the sum of its proper divisors (1).

8978697691 is an equidigital number, since it uses as much as digits as its factorization.

8978697691 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 8978697691 is about 94755.9902644682. The cubic root of 8978697691 is about 2078.4413936331.

The spelling of 8978697691 in words is "eight billion, nine hundred seventy-eight million, six hundred ninety-seven thousand, six hundred ninety-one".