11991119911 has 2 divisors, whose sum is σ = 11991119912. Its totient is φ = 11991119910.

The previous prime is 11991119891. The next prime is 11991119947.

It is a happy number.

11991119911 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 11991119911 - 2²³ = 11982731303 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11991116911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5995559955 + 5995559956.

It is an arithmetic number, because the mean of its divisors is an integer number (5995559956).

Almost surely, 2^11991119911 is an apocalyptic number.

11991119911 is a deficient number, since it is larger than the sum of its proper divisors (1).

11991119911 is an equidigital number, since it uses as much as digits as its factorization.

11991119911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6561, while the sum is 43.

The spelling of 11991119911 in words is "eleven billion, nine hundred ninety-one million, one hundred nineteen thousand, nine hundred eleven".