136686449 has 2 divisors, whose sum is σ = 136686450. Its totient is φ = 136686448.

The previous prime is 136686439. The next prime is 136686457. The reversal of 136686449 is 944686631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120846049 + 15840400 = 10993^2 + 3980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136686449 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 (136686419) 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, 68343224 + 68343225.

It is an arithmetic number, because the mean of its divisors is an integer number (68343225).

Almost surely, 2^136686449 is an apocalyptic number.

It is an amenable number.

136686449 is a deficient number, since it is larger than the sum of its proper divisors (1).

136686449 is an equidigital number, since it uses as much as digits as its factorization.

136686449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 47.

The square root of 136686449 is about 11691.2980032159. The cubic root of 136686449 is about 515.1200888771.

The spelling of 136686449 in words is "one hundred thirty-six million, six hundred eighty-six thousand, four hundred forty-nine".