11111909291 has 16 divisors (see below), whose sum is σ = 13720766400. Its totient is φ = 8964224640.

The previous prime is 11111909287. The next prime is 11111909309. The reversal of 11111909291 is 19290911111.

11111909291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11111909291 - 2² = 11111909287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111909231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 947000 + ... + 958661.

It is an arithmetic number, because the mean of its divisors is an integer number (857547900).

Almost surely, 2^11111909291 is an apocalyptic number.

11111909291 is a deficient number, since it is larger than the sum of its proper divisors (2608857109).

11111909291 is an equidigital number, since it uses as much as digits as its factorization.

11111909291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905699 (or 1905685 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 35.

The spelling of 11111909291 in words is "eleven billion, one hundred eleven million, nine hundred nine thousand, two hundred ninety-one".