6989867771 has 2 divisors, whose sum is σ = 6989867772. Its totient is φ = 6989867770.

The previous prime is 6989867737. The next prime is 6989867779. The reversal of 6989867771 is 1777689896.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6989867771 - 2⁶ = 6989867707 is a prime.

It is not a weakly prime, because it can be changed into another prime (6989867779) 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, 3494933885 + 3494933886.

It is an arithmetic number, because the mean of its divisors is an integer number (3494933886).

Almost surely, 2^6989867771 is an apocalyptic number.

6989867771 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989867771 is an equidigital number, since it uses as much as digits as its factorization.

6989867771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64012032, while the sum is 68.

The square root of 6989867771 is about 83605.4290761073. The cubic root of 6989867771 is about 1912.0077724857.

The spelling of 6989867771 in words is "six billion, nine hundred eighty-nine million, eight hundred sixty-seven thousand, seven hundred seventy-one".