136530209 has 2 divisors, whose sum is σ = 136530210. Its totient is φ = 136530208.

The previous prime is 136530197. The next prime is 136530217. The reversal of 136530209 is 902035631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129390625 + 7139584 = 11375^2 + 2672^2 .

It is a cyclic number.

It is not a de Polignac number, because 136530209 - 2⁴ = 136530193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (136530299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68265104 + 68265105.

It is an arithmetic number, because the mean of its divisors is an integer number (68265105).

Almost surely, 2^136530209 is an apocalyptic number.

It is an amenable number.

136530209 is a deficient number, since it is larger than the sum of its proper divisors (1).

136530209 is an equidigital number, since it uses as much as digits as its factorization.

136530209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 136530209 is about 11684.6141998784. The cubic root of 136530209 is about 514.9237440114.

The spelling of 136530209 in words is "one hundred thirty-six million, five hundred thirty thousand, two hundred nine".