13019117891 has 4 divisors (see below), whose sum is σ = 14020588512. Its totient is φ = 12017647272.

The previous prime is 13019117879. The next prime is 13019117899. The reversal of 13019117891 is 19871191031.

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 13019117891 - 2⁶ = 13019117827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13019117899) 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, 500735291 + ... + 500735316.

It is an arithmetic number, because the mean of its divisors is an integer number (3505147128).

Almost surely, 2^13019117891 is an apocalyptic number.

13019117891 is a deficient number, since it is larger than the sum of its proper divisors (1001470621).

13019117891 is a wasteful number, since it uses less digits than its factorization.

13019117891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001470620.

The product of its (nonzero) digits is 13608, while the sum is 41.

The spelling of 13019117891 in words is "thirteen billion, nineteen million, one hundred seventeen thousand, eight hundred ninety-one".