9999002001001 has 4 divisors (see below), whose sum is σ = 10768156001092. Its totient is φ = 9229848000912.

The previous prime is 9999002000987. The next prime is 9999002001011. The reversal of 9999002001001 is 1001002009999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5759208027225 + 4239793973776 = 2399835^2 + 2059076^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999002001001 - 2⁵ = 9999002000969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999002001011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384577000026 + ... + 384577000051.

It is an arithmetic number, because the mean of its divisors is an integer number (2692039000273).

Almost surely, 2^{9999002001001} is an apocalyptic number.

It is an amenable number.

9999002001001 is a deficient number, since it is larger than the sum of its proper divisors (769154000091).

9999002001001 is a wasteful number, since it uses less digits than its factorization.

9999002001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769154000090.

The product of its (nonzero) digits is 13122, while the sum is 40.

The spelling of 9999002001001 in words is "nine trillion, nine hundred ninety-nine billion, two million, one thousand, one".