9928910209 has 2 divisors, whose sum is σ = 9928910210. Its totient is φ = 9928910208.

The previous prime is 9928910191. The next prime is 9928910219. The reversal of 9928910209 is 9020198299.

It is a happy number.

9928910209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7529379984 + 2399530225 = 86772^2 + 48985^2 .

It is a cyclic number.

It is not a de Polignac number, because 9928910209 - 2¹³ = 9928902017 is a prime.

It is not a weakly prime, because it can be changed into another prime (9928910219) 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, 4964455104 + 4964455105.

It is an arithmetic number, because the mean of its divisors is an integer number (4964455105).

Almost surely, 2^9928910209 is an apocalyptic number.

It is an amenable number.

9928910209 is a deficient number, since it is larger than the sum of its proper divisors (1).

9928910209 is an equidigital number, since it uses as much as digits as its factorization.

9928910209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 9928910209 is about 99643.9170697339. The cubic root of 9928910209 is about 2149.3172671944.

The spelling of 9928910209 in words is "nine billion, nine hundred twenty-eight million, nine hundred ten thousand, two hundred nine".