136840500509 has 2 divisors, whose sum is σ = 136840500510. Its totient is φ = 136840500508.

The previous prime is 136840500497. The next prime is 136840500539. The reversal of 136840500509 is 905005048631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130336884484 + 6503616025 = 361022^2 + 80645^2 .

It is an emirp because it is prime and its reverse (905005048631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136840500509 - 2⁸ = 136840500253 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136840500539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68420250254 + 68420250255.

It is an arithmetic number, because the mean of its divisors is an integer number (68420250255).

Almost surely, 2^136840500509 is an apocalyptic number.

It is an amenable number.

136840500509 is a deficient number, since it is larger than the sum of its proper divisors (1).

136840500509 is an equidigital number, since it uses as much as digits as its factorization.

136840500509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 136840500509 in words is "one hundred thirty-six billion, eight hundred forty million, five hundred thousand, five hundred nine".