9999001909001 has 24 divisors (see below), whose sum is σ = 11761398532296. Its totient is φ = 8475065491200.

The previous prime is 9999001908989. The next prime is 9999001909007. The reversal of 9999001909001 is 1009091009999.

It can be written as a sum of positive squares in 4 ways, for example, as 1175220773776 + 8823781135225 = 1084076^2 + 2970485^2 .

It is not a de Polignac number, because 9999001909001 - 2⁶ = 9999001908937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9999001909007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2676845 + ... + 5211861.

It is an arithmetic number, because the mean of its divisors is an integer number (490058272179).

Almost surely, 2^{9999001909001} is an apocalyptic number.

It is an amenable number.

9999001909001 is a deficient number, since it is larger than the sum of its proper divisors (1762396623295).

9999001909001 is a wasteful number, since it uses less digits than its factorization.

9999001909001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535929 (or 2535922 counting only the distinct ones).

The product of its (nonzero) digits is 531441, while the sum is 56.

The spelling of 9999001909001 in words is "nine trillion, nine hundred ninety-nine billion, one million, nine hundred nine thousand, one".