135698809 has 2 divisors, whose sum is σ = 135698810. Its totient is φ = 135698808.

The previous prime is 135698753. The next prime is 135698813. The reversal of 135698809 is 908896531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127125625 + 8573184 = 11275^2 + 2928^2 .

It is an emirp because it is prime and its reverse (908896531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135698809 - 2⁷ = 135698681 is a prime.

It is not a weakly prime, because it can be changed into another prime (135698009) 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, 67849404 + 67849405.

It is an arithmetic number, because the mean of its divisors is an integer number (67849405).

Almost surely, 2^135698809 is an apocalyptic number.

It is an amenable number.

135698809 is a deficient number, since it is larger than the sum of its proper divisors (1).

135698809 is an equidigital number, since it uses as much as digits as its factorization.

135698809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 135698809 is about 11648.9831745093. The cubic root of 135698809 is about 513.8764067175.

The spelling of 135698809 in words is "one hundred thirty-five million, six hundred ninety-eight thousand, eight hundred nine".