128786111 has 2 divisors, whose sum is σ = 128786112. Its totient is φ = 128786110.

The previous prime is 128786107. The next prime is 128786113. The reversal of 128786111 is 111687821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128786111 - 2² = 128786107 is a prime.

Together with 128786113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128786113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64393055 + 64393056.

It is an arithmetic number, because the mean of its divisors is an integer number (64393056).

Almost surely, 2^128786111 is an apocalyptic number.

128786111 is a deficient number, since it is larger than the sum of its proper divisors (1).

128786111 is an equidigital number, since it uses as much as digits as its factorization.

128786111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 35.

The square root of 128786111 is about 11348.3968471322. The cubic root of 128786111 is about 504.9980211013.

The spelling of 128786111 in words is "one hundred twenty-eight million, seven hundred eighty-six thousand, one hundred eleven".