136209449 has 2 divisors, whose sum is σ = 136209450. Its totient is φ = 136209448.

The previous prime is 136209413. The next prime is 136209467. The reversal of 136209449 is 944902631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76038400 + 60171049 = 8720^2 + 7757^2 .

It is a cyclic number.

It is not a de Polignac number, because 136209449 - 2²⁰ = 135160873 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (136209649) 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, 68104724 + 68104725.

It is an arithmetic number, because the mean of its divisors is an integer number (68104725).

Almost surely, 2^136209449 is an apocalyptic number.

It is an amenable number.

136209449 is a deficient number, since it is larger than the sum of its proper divisors (1).

136209449 is an equidigital number, since it uses as much as digits as its factorization.

136209449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 136209449 is about 11670.8803866718. The cubic root of 136209449 is about 514.5201789774.

The spelling of 136209449 in words is "one hundred thirty-six million, two hundred nine thousand, four hundred forty-nine".