135205223 has 4 divisors (see below), whose sum is σ = 135388920. Its totient is φ = 135021528.

The previous prime is 135205207. The next prime is 135205243. The reversal of 135205223 is 322502531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135205223 - 2⁴ = 135205207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135205243) 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, 90740 + ... + 92217.

It is an arithmetic number, because the mean of its divisors is an integer number (33847230).

Almost surely, 2^135205223 is an apocalyptic number.

135205223 is a deficient number, since it is larger than the sum of its proper divisors (183697).

135205223 is an equidigital number, since it uses as much as digits as its factorization.

135205223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183696.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 135205223 is about 11627.7780766576. The cubic root of 135205223 is about 513.2525978705.

Adding to 135205223 its reverse (322502531), we get a palindrome (457707754).

The spelling of 135205223 in words is "one hundred thirty-five million, two hundred five thousand, two hundred twenty-three".