1111199909 has 2 divisors, whose sum is σ = 1111199910. Its totient is φ = 1111199908.

The previous prime is 1111199861. The next prime is 1111199939. The reversal of 1111199909 is 9099911111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1103236225 + 7963684 = 33215^2 + 2822^2 .

It is an emirp because it is prime and its reverse (9099911111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111199909 - 2⁸ = 1111199653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111199939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555599954 + 555599955.

It is an arithmetic number, because the mean of its divisors is an integer number (555599955).

Almost surely, 2^1111199909 is an apocalyptic number.

It is an amenable number.

1111199909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111199909 is an equidigital number, since it uses as much as digits as its factorization.

1111199909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6561, while the sum is 41.

The square root of 1111199909 is about 33334.6652750556. The cubic root of 1111199909 is about 1035.7717594850.

The spelling of 1111199909 in words is "one billion, one hundred eleven million, one hundred ninety-nine thousand, nine hundred nine".