12001000009 has 4 divisors (see below), whose sum is σ = 12706941204. Its totient is φ = 11295058816.

The previous prime is 12001000003. The next prime is 12001000031. The reversal of 12001000009 is 90000010021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90000010021 = 24799 ⋅3629179.

It can be written as a sum of positive squares in 2 ways, for example, as 3792096400 + 8208903609 = 61580^2 + 90603^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001000009 - 2¹¹ = 12000997961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12001000003) 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, 352970572 + ... + 352970605.

It is an arithmetic number, because the mean of its divisors is an integer number (3176735301).

Almost surely, 2^12001000009 is an apocalyptic number.

It is an amenable number.

12001000009 is a deficient number, since it is larger than the sum of its proper divisors (705941195).

12001000009 is an equidigital number, since it uses as much as digits as its factorization.

12001000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705941194.

The product of its (nonzero) digits is 18, while the sum is 13.

The spelling of 12001000009 in words is "twelve billion, one million, nine", and thus it is an aban number and an uban number.