135123 has 8 divisors (see below), whose sum is σ = 182928. Its totient is φ = 88704.

The previous prime is 135119. The next prime is 135131. The reversal of 135123 is 321531.

It is a happy number.

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

It is not a de Polignac number, because 135123 - 2² = 135119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90 + ... + 527.

It is an arithmetic number, because the mean of its divisors is an integer number (22866).

2¹³⁵¹²³ is an apocalyptic number.

135123 is a deficient number, since it is larger than the sum of its proper divisors (47805).

135123 is an equidigital number, since it uses as much as digits as its factorization.

135123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693.

The product of its digits is 90, while the sum is 15.

The square root of 135123 is about 367.5908051081. The cubic root of 135123 is about 51.3148534519.

Adding to 135123 its reverse (321531), we get a palindrome (456654).

The spelling of 135123 in words is "one hundred thirty-five thousand, one hundred twenty-three".