135617809 has 2 divisors, whose sum is σ = 135617810. Its totient is φ = 135617808.

The previous prime is 135617759. The next prime is 135617827. The reversal of 135617809 is 908716531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88736400 + 46881409 = 9420^2 + 6847^2 .

It is a cyclic number.

It is not a de Polignac number, because 135617809 - 2⁷ = 135617681 is a prime.

It is not a weakly prime, because it can be changed into another prime (135617879) 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, 67808904 + 67808905.

It is an arithmetic number, because the mean of its divisors is an integer number (67808905).

Almost surely, 2^135617809 is an apocalyptic number.

It is an amenable number.

135617809 is a deficient number, since it is larger than the sum of its proper divisors (1).

135617809 is an equidigital number, since it uses as much as digits as its factorization.

135617809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 135617809 is about 11645.5059572352. The cubic root of 135617809 is about 513.7741403480.

The spelling of 135617809 in words is "one hundred thirty-five million, six hundred seventeen thousand, eight hundred nine".