128809553 has 4 divisors (see below), whose sum is σ = 131805168. Its totient is φ = 125813940.

The previous prime is 128809547. The next prime is 128809589. The reversal of 128809553 is 355908821.

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: 355908821 = 17 ⋅20935813.

It is a cyclic number.

It is not a de Polignac number, because 128809553 - 2⁴ = 128809537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128809553.

It is not an unprimeable number, because it can be changed into a prime (128809753) 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, 1497743 + ... + 1497828.

It is an arithmetic number, because the mean of its divisors is an integer number (32951292).

Almost surely, 2^128809553 is an apocalyptic number.

It is an amenable number.

128809553 is a deficient number, since it is larger than the sum of its proper divisors (2995615).

128809553 is an equidigital number, since it uses as much as digits as its factorization.

128809553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995614.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 128809553 is about 11349.4296332459. The cubic root of 128809553 is about 505.0286596158.

The spelling of 128809553 in words is "one hundred twenty-eight million, eight hundred nine thousand, five hundred fifty-three".