11391178111 has 4 divisors (see below), whose sum is σ = 11402838432. Its totient is φ = 11379517792.

The previous prime is 11391178093. The next prime is 11391178121. The reversal of 11391178111 is 11187119311.

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 11391178111 - 2⁹ = 11391177599 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 (11391178121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5828695 + ... + 5830648.

It is an arithmetic number, because the mean of its divisors is an integer number (2850709608).

Almost surely, 2^11391178111 is an apocalyptic number.

11391178111 is a deficient number, since it is larger than the sum of its proper divisors (11660321).

11391178111 is an equidigital number, since it uses as much as digits as its factorization.

11391178111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11660320.

The product of its digits is 1512, while the sum is 34.

The spelling of 11391178111 in words is "eleven billion, three hundred ninety-one million, one hundred seventy-eight thousand, one hundred eleven".