9999009997 has 2 divisors, whose sum is σ = 9999009998. Its totient is φ = 9999009996.

The previous prime is 9999009991. The next prime is 9999010057. The reversal of 9999009997 is 7999009999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6193847401 + 3805162596 = 78701^2 + 61686^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999009997 - 2¹⁹ = 9998485709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999009991) 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, 4999504998 + 4999504999.

It is an arithmetic number, because the mean of its divisors is an integer number (4999504999).

Almost surely, 2^9999009997 is an apocalyptic number.

It is an amenable number.

9999009997 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999009997 is an equidigital number, since it uses as much as digits as its factorization.

9999009997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33480783, while the sum is 70.

The square root of 9999009997 is about 99995.0498624807. The cubic root of 9999009997 is about 2154.3635911253.

The spelling of 9999009997 in words is "nine billion, nine hundred ninety-nine million, nine thousand, nine hundred ninety-seven".