12005136509 has 2 divisors, whose sum is σ = 12005136510. Its totient is φ = 12005136508.

The previous prime is 12005136457. The next prime is 12005136547. The reversal of 12005136509 is 90563150021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11969016409 + 36120100 = 109403^2 + 6010^2 .

It is a cyclic number.

It is not a de Polignac number, because 12005136509 - 2³² = 7710169213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12005136599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6002568254 + 6002568255.

It is an arithmetic number, because the mean of its divisors is an integer number (6002568255).

Almost surely, 2^12005136509 is an apocalyptic number.

It is an amenable number.

12005136509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12005136509 is an equidigital number, since it uses as much as digits as its factorization.

12005136509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 32.

The spelling of 12005136509 in words is "twelve billion, five million, one hundred thirty-six thousand, five hundred nine".