135517 has 4 divisors (see below), whose sum is σ = 140220. Its totient is φ = 130816.

The previous prime is 135511. The next prime is 135533. The reversal of 135517 is 715531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 715531 = 353 ⋅2027.

It can be written as a sum of positive squares in 2 ways, for example, as 106276 + 29241 = 326^2 + 171^2 .

It is a cyclic number.

It is not a de Polignac number, because 135517 - 2⁷ = 135389 is a prime.

It is a Duffinian number.

135517 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135511) 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, 2308 + ... + 2365.

It is an arithmetic number, because the mean of its divisors is an integer number (35055).

2¹³⁵⁵¹⁷ is an apocalyptic number.

It is an amenable number.

135517 is a deficient number, since it is larger than the sum of its proper divisors (4703).

135517 is an equidigital number, since it uses as much as digits as its factorization.

135517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4702.

The product of its digits is 525, while the sum is 22.

The square root of 135517 is about 368.1263370095. The cubic root of 135517 is about 51.3646807278.

The spelling of 135517 in words is "one hundred thirty-five thousand, five hundred seventeen".