135817 has 4 divisors (see below), whose sum is σ = 148176. Its totient is φ = 123460.

The previous prime is 135799. The next prime is 135829. The reversal of 135817 is 718531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135817 - 2¹¹ = 133769 is a prime.

It is a Duffinian number.

135817 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 135791 and 135800.

It is not an unprimeable number, because it can be changed into a prime (135887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6163 + ... + 6184.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

2¹³⁵⁸¹⁷ is an apocalyptic number.

It is an amenable number.

135817 is a deficient number, since it is larger than the sum of its proper divisors (12359).

135817 is a wasteful number, since it uses less digits than its factorization.

135817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12358.

The product of its digits is 840, while the sum is 25.

The square root of 135817 is about 368.5335805595. The cubic root of 135817 is about 51.4025555513.

The spelling of 135817 in words is "one hundred thirty-five thousand, eight hundred seventeen".