12043015909 has 2 divisors, whose sum is σ = 12043015910. Its totient is φ = 12043015908.

The previous prime is 12043015843. The next prime is 12043015913. The reversal of 12043015909 is 90951034021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9849967009 + 2193048900 = 99247^2 + 46830^2 .

It is an emirp because it is prime and its reverse (90951034021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12043015909 - 2¹⁹ = 12042491621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12043015939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6021507954 + 6021507955.

It is an arithmetic number, because the mean of its divisors is an integer number (6021507955).

Almost surely, 2^12043015909 is an apocalyptic number.

It is an amenable number.

12043015909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12043015909 is an equidigital number, since it uses as much as digits as its factorization.

12043015909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The spelling of 12043015909 in words is "twelve billion, forty-three million, fifteen thousand, nine hundred nine".