128811107 has 4 divisors (see below), whose sum is σ = 132966336. Its totient is φ = 124655880.

The previous prime is 128811083. The next prime is 128811119. The reversal of 128811107 is 701118821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128811107 - 2²² = 124616803 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128811107.

It is not an unprimeable number, because it can be changed into a prime (128811197) 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 in 3 ways as a sum of consecutive naturals, for example, 2077568 + ... + 2077629.

It is an arithmetic number, because the mean of its divisors is an integer number (33241584).

Almost surely, 2^128811107 is an apocalyptic number.

128811107 is a deficient number, since it is larger than the sum of its proper divisors (4155229).

128811107 is an equidigital number, since it uses as much as digits as its factorization.

128811107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155228.

The product of its (nonzero) digits is 896, while the sum is 29.

The square root of 128811107 is about 11349.4980946296. The cubic root of 128811107 is about 505.0306905506.

Adding to 128811107 its reverse (701118821), we get a palindrome (829929928).

The spelling of 128811107 in words is "one hundred twenty-eight million, eight hundred eleven thousand, one hundred seven".