135520309 has 2 divisors, whose sum is σ = 135520310. Its totient is φ = 135520308.

The previous prime is 135520267. The next prime is 135520351. The reversal of 135520309 is 903025531.

It is a balanced prime because it is at equal distance from previous prime (135520267) and next prime (135520351).

It can be written as a sum of positive squares in only one way, i.e., 127803025 + 7717284 = 11305^2 + 2778^2 .

It is a cyclic number.

It is not a de Polignac number, because 135520309 - 2⁷ = 135520181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135520009) 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, 67760154 + 67760155.

It is an arithmetic number, because the mean of its divisors is an integer number (67760155).

Almost surely, 2^135520309 is an apocalyptic number.

It is an amenable number.

135520309 is a deficient number, since it is larger than the sum of its proper divisors (1).

135520309 is an equidigital number, since it uses as much as digits as its factorization.

135520309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 135520309 is about 11641.3190403837. The cubic root of 135520309 is about 513.6509879185.

The spelling of 135520309 in words is "one hundred thirty-five million, five hundred twenty thousand, three hundred nine".