11209999991 has 2 divisors, whose sum is σ = 11209999992. Its totient is φ = 11209999990.

The previous prime is 11209999987. The next prime is 11210000023. The reversal of 11209999991 is 19999990211.

11209999991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11209999991 - 2² = 11209999987 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11209999991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11209999901) 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 as a sum of consecutive naturals, namely, 5604999995 + 5604999996.

It is an arithmetic number, because the mean of its divisors is an integer number (5604999996).

Almost surely, 2^11209999991 is an apocalyptic number.

11209999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11209999991 is an equidigital number, since it uses as much as digits as its factorization.

11209999991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1062882, while the sum is 59.

The spelling of 11209999991 in words is "eleven billion, two hundred nine million, nine hundred ninety-nine thousand, nine hundred ninety-one".