135517809 has 16 divisors (see below), whose sum is σ = 206735360. Its totient is φ = 77351760.

The previous prime is 135517807. The next prime is 135517813. The reversal of 135517809 is 908715531.

It is not a de Polignac number, because 135517809 - 2¹ = 135517807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135517807) 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 in 15 ways as a sum of consecutive naturals, for example, 18714 + ... + 24924.

It is an arithmetic number, because the mean of its divisors is an integer number (12920960).

Almost surely, 2^135517809 is an apocalyptic number.

It is an amenable number.

135517809 is a deficient number, since it is larger than the sum of its proper divisors (71217551).

135517809 is a wasteful number, since it uses less digits than its factorization.

135517809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7260.

The product of its (nonzero) digits is 37800, while the sum is 39.

The square root of 135517809 is about 11641.2116637402. The cubic root of 135517809 is about 513.6478293873.

The spelling of 135517809 in words is "one hundred thirty-five million, five hundred seventeen thousand, eight hundred nine".