136615309 has 2 divisors, whose sum is σ = 136615310. Its totient is φ = 136615308.

The previous prime is 136615273. The next prime is 136615337. The reversal of 136615309 is 903516631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136188900 + 426409 = 11670^2 + 653^2 .

It is a cyclic number.

It is not a de Polignac number, because 136615309 - 2¹⁵ = 136582541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136615379) 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, 68307654 + 68307655.

It is an arithmetic number, because the mean of its divisors is an integer number (68307655).

Almost surely, 2^136615309 is an apocalyptic number.

It is an amenable number.

136615309 is a deficient number, since it is larger than the sum of its proper divisors (1).

136615309 is an equidigital number, since it uses as much as digits as its factorization.

136615309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 136615309 is about 11688.2551734637. The cubic root of 136615309 is about 515.0307066870.

The spelling of 136615309 in words is "one hundred thirty-six million, six hundred fifteen thousand, three hundred nine".