12051393509 has 2 divisors, whose sum is σ = 12051393510. Its totient is φ = 12051393508.

The previous prime is 12051393479. The next prime is 12051393533. The reversal of 12051393509 is 90539315021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11995068484 + 56325025 = 109522^2 + 7505^2 .

It is an emirp because it is prime and its reverse (90539315021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12051393509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12051393709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6025696754 + 6025696755.

It is an arithmetic number, because the mean of its divisors is an integer number (6025696755).

Almost surely, 2^12051393509 is an apocalyptic number.

It is an amenable number.

12051393509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12051393509 is an equidigital number, since it uses as much as digits as its factorization.

12051393509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 38.

The spelling of 12051393509 in words is "twelve billion, fifty-one million, three hundred ninety-three thousand, five hundred nine".