136865009 has 2 divisors, whose sum is σ = 136865010. Its totient is φ = 136865008.

The previous prime is 136864991. The next prime is 136865033. The reversal of 136865009 is 900568631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74770609 + 62094400 = 8647^2 + 7880^2 .

It is a cyclic number.

It is not a de Polignac number, because 136865009 - 2²⁰ = 135816433 is a prime.

It is not a weakly prime, because it can be changed into another prime (136865039) 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, 68432504 + 68432505.

It is an arithmetic number, because the mean of its divisors is an integer number (68432505).

Almost surely, 2^136865009 is an apocalyptic number.

It is an amenable number.

136865009 is a deficient number, since it is larger than the sum of its proper divisors (1).

136865009 is an equidigital number, since it uses as much as digits as its factorization.

136865009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 136865009 is about 11698.9319597987. The cubic root of 136865009 is about 515.3442998852.

The spelling of 136865009 in words is "one hundred thirty-six million, eight hundred sixty-five thousand, nine".