7768909121 has 2 divisors, whose sum is σ = 7768909122. Its totient is φ = 7768909120.

The previous prime is 7768909091. The next prime is 7768909153. The reversal of 7768909121 is 1219098677.

7768909121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5827184896 + 1941724225 = 76336^2 + 44065^2 .

It is an emirp because it is prime and its reverse (1219098677) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7768909121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7768909121.

It is not a weakly prime, because it can be changed into another prime (7768909171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3884454560 + 3884454561.

It is an arithmetic number, because the mean of its divisors is an integer number (3884454561).

Almost surely, 2^7768909121 is an apocalyptic number.

It is an amenable number.

7768909121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7768909121 is an equidigital number, since it uses as much as digits as its factorization.

7768909121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 50.

The square root of 7768909121 is about 88141.4154696871. The cubic root of 7768909121 is about 1980.5539654097.

The spelling of 7768909121 in words is "seven billion, seven hundred sixty-eight million, nine hundred nine thousand, one hundred twenty-one".