12011002009 has 4 divisors (see below), whose sum is σ = 12013164340. Its totient is φ = 12008839680.

The previous prime is 12011001983. The next prime is 12011002067. The reversal of 12011002009 is 90020011021.

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 1096603225 + 10914398784 = 33115^2 + 104472^2 .

It is a cyclic number.

It is not a de Polignac number, because 12011002009 - 2¹¹ = 12010999961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011001983 and 12011002001.

It is not an unprimeable number, because it can be changed into a prime (12011002309) 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, 1072812 + ... + 1083949.

It is an arithmetic number, because the mean of its divisors is an integer number (3003291085).

Almost surely, 2^12011002009 is an apocalyptic number.

It is an amenable number.

12011002009 is a deficient number, since it is larger than the sum of its proper divisors (2162331).

12011002009 is an equidigital number, since it uses as much as digits as its factorization.

12011002009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162330.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 12011002009 in words is "twelve billion, eleven million, two thousand, nine".