135809817 has 32 divisors (see below), whose sum is σ = 215187840. Its totient is φ = 75102720.

The previous prime is 135809801. The next prime is 135809879. The reversal of 135809817 is 718908531.

It is not a de Polignac number, because 135809817 - 2⁴ = 135809801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135809887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36403 + ... + 39959.

It is an arithmetic number, because the mean of its divisors is an integer number (6724620).

Almost surely, 2^135809817 is an apocalyptic number.

It is an amenable number.

135809817 is a deficient number, since it is larger than the sum of its proper divisors (79378023).

135809817 is a wasteful number, since it uses less digits than its factorization.

135809817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673.

The product of its (nonzero) digits is 60480, while the sum is 42.

The square root of 135809817 is about 11653.7469081837. The cubic root of 135809817 is about 514.0164935383.

The spelling of 135809817 in words is "one hundred thirty-five million, eight hundred nine thousand, eight hundred seventeen".