13243985791 has 4 divisors (see below), whose sum is σ = 13244507872. Its totient is φ = 13243463712.

The previous prime is 13243985759. The next prime is 13243985801. The reversal of 13243985791 is 19758934231.

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 13243985791 - 2⁵ = 13243985759 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 (13243485791) 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, 220935 + ... + 274408.

It is an arithmetic number, because the mean of its divisors is an integer number (3311126968).

Almost surely, 2^13243985791 is an apocalyptic number.

13243985791 is a deficient number, since it is larger than the sum of its proper divisors (522081).

13243985791 is an equidigital number, since it uses as much as digits as its factorization.

13243985791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522080.

The product of its digits is 1632960, while the sum is 52.

The spelling of 13243985791 in words is "thirteen billion, two hundred forty-three million, nine hundred eighty-five thousand, seven hundred ninety-one".