135217 has 4 divisors (see below), whose sum is σ = 141120. Its totient is φ = 129316.

The previous prime is 135211. The next prime is 135221. The reversal of 135217 is 712531.

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 135217 - 2³ = 135209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135194 and 135203.

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

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 3 ways as a sum of consecutive naturals, for example, 2917 + ... + 2962.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2¹³⁵²¹⁷ is an apocalyptic number.

It is an amenable number.

135217 is a deficient number, since it is larger than the sum of its proper divisors (5903).

135217 is an equidigital number, since it uses as much as digits as its factorization.

135217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5902.

The product of its digits is 210, while the sum is 19.

The square root of 135217 is about 367.7186424428. The cubic root of 135217 is about 51.3267499663.

Adding to 135217 its reverse (712531), we get a palindrome (847748).

It can be divided in two parts, 1352 and 17, that added together give a square (1369 = 37²).

The spelling of 135217 in words is "one hundred thirty-five thousand, two hundred seventeen".