11991173119 has 4 divisors (see below), whose sum is σ = 12512528496. Its totient is φ = 11469817744.

The previous prime is 11991173081. The next prime is 11991173179. The reversal of 11991173119 is 91137119911.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11991173119 - 2⁹ = 11991172607 is a prime.

It is a super-2 number, since 2×11991173119² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11991173179) 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, 260677654 + ... + 260677699.

It is an arithmetic number, because the mean of its divisors is an integer number (3128132124).

Almost surely, 2^11991173119 is an apocalyptic number.

11991173119 is a deficient number, since it is larger than the sum of its proper divisors (521355377).

11991173119 is an equidigital number, since it uses as much as digits as its factorization.

11991173119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521355376.

The product of its digits is 15309, while the sum is 43.

The spelling of 11991173119 in words is "eleven billion, nine hundred ninety-one million, one hundred seventy-three thousand, one hundred nineteen".