128910569 has 4 divisors (see below), whose sum is σ = 129111696. Its totient is φ = 128709444.

The previous prime is 128910557. The next prime is 128910571. The reversal of 128910569 is 965019821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 965019821 = 163 ⋅5920367.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128910569 is a prime.

It is a super-2 number, since 2×128910569² = 33235869599807522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128910589) 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, 99599 + ... + 100884.

It is an arithmetic number, because the mean of its divisors is an integer number (32277924).

Almost surely, 2^128910569 is an apocalyptic number.

It is an amenable number.

128910569 is a deficient number, since it is larger than the sum of its proper divisors (201127).

128910569 is an equidigital number, since it uses as much as digits as its factorization.

128910569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201126.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 128910569 is about 11353.8790287725. The cubic root of 128910569 is about 505.1606442491.

The spelling of 128910569 in words is "one hundred twenty-eight million, nine hundred ten thousand, five hundred sixty-nine".