128868611 has 2 divisors, whose sum is σ = 128868612. Its totient is φ = 128868610.

The previous prime is 128868589. The next prime is 128868631. The reversal of 128868611 is 116868821.

It is a strong prime.

It is an emirp because it is prime and its reverse (116868821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128868611 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128868631) 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, 64434305 + 64434306.

It is an arithmetic number, because the mean of its divisors is an integer number (64434306).

Almost surely, 2^128868611 is an apocalyptic number.

128868611 is a deficient number, since it is larger than the sum of its proper divisors (1).

128868611 is an equidigital number, since it uses as much as digits as its factorization.

128868611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 41.

The square root of 128868611 is about 11352.0311398445. The cubic root of 128868611 is about 505.1058314941.

The spelling of 128868611 in words is "one hundred twenty-eight million, eight hundred sixty-eight thousand, six hundred eleven".