136548509 has 2 divisors, whose sum is σ = 136548510. Its totient is φ = 136548508.

The previous prime is 136548487. The next prime is 136548553. The reversal of 136548509 is 905845631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112996900 + 23551609 = 10630^2 + 4853^2 .

It is a cyclic number.

It is not a de Polignac number, because 136548509 - 2⁸ = 136548253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136548569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68274254 + 68274255.

It is an arithmetic number, because the mean of its divisors is an integer number (68274255).

Almost surely, 2^136548509 is an apocalyptic number.

It is an amenable number.

136548509 is a deficient number, since it is larger than the sum of its proper divisors (1).

136548509 is an equidigital number, since it uses as much as digits as its factorization.

136548509 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 square root of 136548509 is about 11685.3972546936. The cubic root of 136548509 is about 514.9467491363.

The spelling of 136548509 in words is "one hundred thirty-six million, five hundred forty-eight thousand, five hundred nine".