135218 has 16 divisors (see below), whose sum is σ = 222264. Its totient is φ = 61440.

The previous prime is 135211. The next prime is 135221. The reversal of 135218 is 812531.

It can be written as a sum of positive squares in 4 ways, for example, as 97969 + 37249 = 313^2 + 193^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 135218.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 135218.

It is not an unprimeable number, because it can be changed into a prime (135211) by changing a digit.

135218 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1346 + ... + 1442.

2¹³⁵²¹⁸ is an apocalyptic number.

135218 is a deficient number, since it is larger than the sum of its proper divisors (87046).

135218 is a wasteful number, since it uses less digits than its factorization.

135218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157.

The product of its digits is 240, while the sum is 20.

The square root of 135218 is about 367.7200021756. The cubic root of 135218 is about 51.3268764953.

Adding to 135218 its reverse (812531), we get a palindrome (947749).

It can be divided in two parts, 1352 and 18, that multiplied together give a square (24336 = 156²).

The spelling of 135218 in words is "one hundred thirty-five thousand, two hundred eighteen".