135506 has 8 divisors (see below), whose sum is σ = 232320. Its totient is φ = 58068.

The previous prime is 135497. The next prime is 135511. The reversal of 135506 is 605531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4826 + ... + 4853.

It is an arithmetic number, because the mean of its divisors is an integer number (29040).

2¹³⁵⁵⁰⁶ is an apocalyptic number.

135506 is a deficient number, since it is larger than the sum of its proper divisors (96814).

135506 is an equidigital number, since it uses as much as digits as its factorization.

135506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9688.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 135506 is about 368.1113961833. Note that the first 3 decimals coincide. The cubic root of 135506 is about 51.3632909224.

The spelling of 135506 in words is "one hundred thirty-five thousand, five hundred six".