128801111 has 2 divisors, whose sum is σ = 128801112. Its totient is φ = 128801110.

The previous prime is 128801051. The next prime is 128801117. The reversal of 128801111 is 111108821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128801111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128801117) 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, 64400555 + 64400556.

It is an arithmetic number, because the mean of its divisors is an integer number (64400556).

Almost surely, 2^128801111 is an apocalyptic number.

128801111 is a deficient number, since it is larger than the sum of its proper divisors (1).

128801111 is an equidigital number, since it uses as much as digits as its factorization.

128801111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 23.

The square root of 128801111 is about 11349.0577141893. The cubic root of 128801111 is about 505.0176264148.

Adding to 128801111 its reverse (111108821), we get a palindrome (239909932).

The spelling of 128801111 in words is "one hundred twenty-eight million, eight hundred one thousand, one hundred eleven".