9984821009 has 2 divisors, whose sum is σ = 9984821010. Its totient is φ = 9984821008.

The previous prime is 9984820957. The next prime is 9984821023. The reversal of 9984821009 is 9001284899.

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., 9793081600 + 191739409 = 98960^2 + 13847^2 .

It is a cyclic number.

It is not a de Polignac number, because 9984821009 - 2³² = 5689853713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9984821039) 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, 4992410504 + 4992410505.

It is an arithmetic number, because the mean of its divisors is an integer number (4992410505).

Almost surely, 2^9984821009 is an apocalyptic number.

It is an amenable number.

9984821009 is a deficient number, since it is larger than the sum of its proper divisors (1).

9984821009 is an equidigital number, since it uses as much as digits as its factorization.

9984821009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 9984821009 is about 99924.0762229004. The cubic root of 9984821009 is about 2153.3440665345.

The spelling of 9984821009 in words is "nine billion, nine hundred eighty-four million, eight hundred twenty-one thousand, nine".