13128911 has 4 divisors (see below), whose sum is σ = 13156800. Its totient is φ = 13101024.

The previous prime is 13128901. The next prime is 13128917. The reversal of 13128911 is 11982131.

13128911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13128911 - 2¹⁰ = 13127887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13128917) 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, 13226 + ... + 14183.

It is an arithmetic number, because the mean of its divisors is an integer number (3289200).

Almost surely, 2^13128911 is an apocalyptic number.

13128911 is a deficient number, since it is larger than the sum of its proper divisors (27889).

13128911 is an equidigital number, since it uses as much as digits as its factorization.

13128911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27888.

The product of its digits is 432, while the sum is 26.

The square root of 13128911 is about 3623.3839156236. The cubic root of 13128911 is about 235.9081264048.

The spelling of 13128911 in words is "thirteen million, one hundred twenty-eight thousand, nine hundred eleven".