9990000001 has 2 divisors, whose sum is σ = 9990000002. Its totient is φ = 9990000000.

The previous prime is 9989999933. The next prime is 9990000019. The reversal of 9990000001 is 1000000999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6412165776 + 3577834225 = 80076^2 + 59815^2 .

It is a cyclic number.

It is not a de Polignac number, because 9990000001 - 2³³ = 1400065409 is a prime.

It is not a weakly prime, because it can be changed into another prime (9990000061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995000000 + 4995000001.

It is an arithmetic number, because the mean of its divisors is an integer number (4995000001).

Almost surely, 2^9990000001 is an apocalyptic number.

It is an amenable number.

9990000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990000001 is an equidigital number, since it uses as much as digits as its factorization.

9990000001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 9990000001 is about 99949.9874987486. The cubic root of 9990000001 is about 2153.7163056924.

The spelling of 9990000001 in words is "nine billion, nine hundred ninety million, one", and thus it is an aban number.