9999613909 has 2 divisors, whose sum is σ = 9999613910. Its totient is φ = 9999613908.

The previous prime is 9999613907. The next prime is 9999613919. The reversal of 9999613909 is 9093169999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7863787684 + 2135826225 = 88678^2 + 46215^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999613909 - 2¹ = 9999613907 is a prime.

Together with 9999613907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999613907) 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, 4999806954 + 4999806955.

It is an arithmetic number, because the mean of its divisors is an integer number (4999806955).

Almost surely, 2^9999613909 is an apocalyptic number.

It is an amenable number.

9999613909 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999613909 is an equidigital number, since it uses as much as digits as its factorization.

9999613909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9565938, while the sum is 64.

The square root of 9999613909 is about 99998.0695263664. The cubic root of 9999613909 is about 2154.4069627469.

The spelling of 9999613909 in words is "nine billion, nine hundred ninety-nine million, six hundred thirteen thousand, nine hundred nine".