9911111009 has 2 divisors, whose sum is σ = 9911111010. Its totient is φ = 9911111008.

The previous prime is 9911111003. The next prime is 9911111059. The reversal of 9911111009 is 9001111199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9511710784 + 399400225 = 97528^2 + 19985^2 .

It is a cyclic number.

It is not a de Polignac number, because 9911111009 - 2²⁴ = 9894333793 is a prime.

It is not a weakly prime, because it can be changed into another prime (9911111003) 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, 4955555504 + 4955555505.

It is an arithmetic number, because the mean of its divisors is an integer number (4955555505).

Almost surely, 2^9911111009 is an apocalyptic number.

It is an amenable number.

9911111009 is a deficient number, since it is larger than the sum of its proper divisors (1).

9911111009 is an equidigital number, since it uses as much as digits as its factorization.

9911111009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 32.

The square root of 9911111009 is about 99554.5629742806. The cubic root of 9911111009 is about 2148.0321643980.

The spelling of 9911111009 in words is "nine billion, nine hundred eleven million, one hundred eleven thousand, nine".