136209949 has 2 divisors, whose sum is σ = 136209950. Its totient is φ = 136209948.

The previous prime is 136209907. The next prime is 136209971. The reversal of 136209949 is 949902631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132089049 + 4120900 = 11493^2 + 2030^2 .

It is a cyclic number.

It is not a de Polignac number, because 136209949 - 2¹³ = 136201757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136209449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68104974 + 68104975.

It is an arithmetic number, because the mean of its divisors is an integer number (68104975).

Almost surely, 2^136209949 is an apocalyptic number.

It is an amenable number.

136209949 is a deficient number, since it is larger than the sum of its proper divisors (1).

136209949 is an equidigital number, since it uses as much as digits as its factorization.

136209949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 136209949 is about 11670.9018074869. The cubic root of 136209949 is about 514.5208085465.

The spelling of 136209949 in words is "one hundred thirty-six million, two hundred nine thousand, nine hundred forty-nine".