11191383871 has 4 divisors (see below), whose sum is σ = 11210005744. Its totient is φ = 11172762000.

The previous prime is 11191383859. The next prime is 11191383893. The reversal of 11191383871 is 17838319111.

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 11191383871 - 2¹⁹ = 11190859583 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 (11191383851) 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, 9310035 + ... + 9311236.

It is an arithmetic number, because the mean of its divisors is an integer number (2802501436).

Almost surely, 2^11191383871 is an apocalyptic number.

11191383871 is a deficient number, since it is larger than the sum of its proper divisors (18621873).

11191383871 is an equidigital number, since it uses as much as digits as its factorization.

11191383871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18621872.

The product of its digits is 36288, while the sum is 43.

The spelling of 11191383871 in words is "eleven billion, one hundred ninety-one million, three hundred eighty-three thousand, eight hundred seventy-one".