11191969211 has 4 divisors (see below), whose sum is σ = 11678576592. Its totient is φ = 10705361832.

The previous prime is 11191969123. The next prime is 11191969213. The reversal of 11191969211 is 11296919111.

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 11191969211 - 2²⁶ = 11124860347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11191969213) 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, 243303656 + ... + 243303701.

It is an arithmetic number, because the mean of its divisors is an integer number (2919644148).

Almost surely, 2^11191969211 is an apocalyptic number.

11191969211 is a deficient number, since it is larger than the sum of its proper divisors (486607381).

11191969211 is an equidigital number, since it uses as much as digits as its factorization.

11191969211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486607380.

The product of its digits is 8748, while the sum is 41.

The spelling of 11191969211 in words is "eleven billion, one hundred ninety-one million, nine hundred sixty-nine thousand, two hundred eleven".