9919524809 has 2 divisors, whose sum is σ = 9919524810. Its totient is φ = 9919524808.

The previous prime is 9919524799. The next prime is 9919524877. The reversal of 9919524809 is 9084259199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9486760000 + 432764809 = 97400^2 + 20803^2 .

It is a cyclic number.

It is not a de Polignac number, because 9919524809 - 2¹² = 9919520713 is a prime.

It is not a weakly prime, because it can be changed into another prime (9919544809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4959762404 + 4959762405.

It is an arithmetic number, because the mean of its divisors is an integer number (4959762405).

Almost surely, 2^9919524809 is an apocalyptic number.

It is an amenable number.

9919524809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9919524809 is an equidigital number, since it uses as much as digits as its factorization.

9919524809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2099520, while the sum is 56.

The square root of 9919524809 is about 99596.8112391155. The cubic root of 9919524809 is about 2148.6398326057.

The spelling of 9919524809 in words is "nine billion, nine hundred nineteen million, five hundred twenty-four thousand, eight hundred nine".