128412289 has 4 divisors (see below), whose sum is σ = 133995456. Its totient is φ = 122829124.

The previous prime is 128412281. The next prime is 128412293. The reversal of 128412289 is 982214821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128412289 - 2³ = 128412281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128412281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2791549 + ... + 2791594.

It is an arithmetic number, because the mean of its divisors is an integer number (33498864).

Almost surely, 2^128412289 is an apocalyptic number.

It is an amenable number.

128412289 is a deficient number, since it is larger than the sum of its proper divisors (5583167).

128412289 is an equidigital number, since it uses as much as digits as its factorization.

128412289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5583166.

The product of its digits is 18432, while the sum is 37.

The square root of 128412289 is about 11331.9146219869. The cubic root of 128412289 is about 504.5089354438.

The spelling of 128412289 in words is "one hundred twenty-eight million, four hundred twelve thousand, two hundred eighty-nine".