13128711 has 4 divisors (see below), whose sum is σ = 17504952. Its totient is φ = 8752472.

The previous prime is 13128707. The next prime is 13128719. The reversal of 13128711 is 11782131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11782131 = 3 ⋅3927377.

It is a cyclic number.

It is not a de Polignac number, because 13128711 - 2² = 13128707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13128719) 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, 2188116 + ... + 2188121.

It is an arithmetic number, because the mean of its divisors is an integer number (4376238).

Almost surely, 2^13128711 is an apocalyptic number.

13128711 is a deficient number, since it is larger than the sum of its proper divisors (4376241).

13128711 is an equidigital number, since it uses as much as digits as its factorization.

13128711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4376240.

The product of its digits is 336, while the sum is 24.

The square root of 13128711 is about 3623.3563170078. The cubic root of 13128711 is about 235.9069284921.

The spelling of 13128711 in words is "thirteen million, one hundred twenty-eight thousand, seven hundred eleven".