128811189 has 8 divisors (see below), whose sum is σ = 184959712. Its totient is φ = 79268400.

The previous prime is 128811181. The next prime is 128811191. The reversal of 128811189 is 981118821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128811189 - 2³ = 128811181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 3302851 = 128811189 / (1 + 2 + 8 + 8 + 1 + 1 + 1 + 8 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128811181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1651387 + ... + 1651464.

It is an arithmetic number, because the mean of its divisors is an integer number (23119964).

Almost surely, 2^128811189 is an apocalyptic number.

It is an amenable number.

128811189 is a deficient number, since it is larger than the sum of its proper divisors (56148523).

128811189 is a wasteful number, since it uses less digits than its factorization.

128811189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3302867.

The product of its digits is 9216, while the sum is 39.

The square root of 128811189 is about 11349.5017071235. The cubic root of 128811189 is about 505.0307977166.

The spelling of 128811189 in words is "one hundred twenty-eight million, eight hundred eleven thousand, one hundred eighty-nine".