9999119909 has 2 divisors, whose sum is σ = 9999119910. Its totient is φ = 9999119908.

The previous prime is 9999119903. The next prime is 9999119917. The reversal of 9999119909 is 9099119999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9584997409 + 414122500 = 97903^2 + 20350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9999119909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999119903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999559954 + 4999559955.

It is an arithmetic number, because the mean of its divisors is an integer number (4999559955).

Almost surely, 2^9999119909 is an apocalyptic number.

It is an amenable number.

9999119909 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999119909 is an equidigital number, since it uses as much as digits as its factorization.

9999119909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4782969, while the sum is 65.

The square root of 9999119909 is about 99995.5994481757. The cubic root of 9999119909 is about 2154.3714848916.

It can be divided in two parts, 999911 and 9909, that multiplied together give a palindrome (9908118099).

The spelling of 9999119909 in words is "nine billion, nine hundred ninety-nine million, one hundred nineteen thousand, nine hundred nine".