135845609 has 2 divisors, whose sum is σ = 135845610. Its totient is φ = 135845608.

The previous prime is 135845561. The next prime is 135845617. The reversal of 135845609 is 906548531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121000000 + 14845609 = 11000^2 + 3853^2 .

It is a cyclic number.

It is not a de Polignac number, because 135845609 - 2¹² = 135841513 is a prime.

It is not a weakly prime, because it can be changed into another prime (135845639) 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, 67922804 + 67922805.

It is an arithmetic number, because the mean of its divisors is an integer number (67922805).

Almost surely, 2^135845609 is an apocalyptic number.

It is an amenable number.

135845609 is a deficient number, since it is larger than the sum of its proper divisors (1).

135845609 is an equidigital number, since it uses as much as digits as its factorization.

135845609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 135845609 is about 11655.2824504600. The cubic root of 135845609 is about 514.0616450665.

The spelling of 135845609 in words is "one hundred thirty-five million, eight hundred forty-five thousand, six hundred nine".