13206579891 has 4 divisors (see below), whose sum is σ = 17608773192. Its totient is φ = 8804386592.

The previous prime is 13206579871. The next prime is 13206579899. The reversal of 13206579891 is 19897560231.

13206579891 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 a de Polignac number, because none of the positive numbers 2^k-13206579891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13206579899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2201096646 + ... + 2201096651.

It is an arithmetic number, because the mean of its divisors is an integer number (4402193298).

Almost surely, 2^13206579891 is an apocalyptic number.

13206579891 is a deficient number, since it is larger than the sum of its proper divisors (4402193301).

13206579891 is an equidigital number, since it uses as much as digits as its factorization.

13206579891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4402193300.

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 13206579891 in words is "thirteen billion, two hundred six million, five hundred seventy-nine thousand, eight hundred ninety-one".