135124123 has 4 divisors (see below), whose sum is σ = 135623008. Its totient is φ = 134625240.

The previous prime is 135124117. The next prime is 135124127. The reversal of 135124123 is 321421531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321421531 = 3943 ⋅81517.

It is a cyclic number.

It is not a de Polignac number, because 135124123 - 2¹³ = 135115931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135124094 and 135124103.

It is not an unprimeable number, because it can be changed into a prime (135124127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249036 + ... + 249577.

It is an arithmetic number, because the mean of its divisors is an integer number (33905752).

Almost surely, 2^135124123 is an apocalyptic number.

135124123 is a deficient number, since it is larger than the sum of its proper divisors (498885).

135124123 is an equidigital number, since it uses as much as digits as its factorization.

135124123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498884.

The product of its digits is 720, while the sum is 22.

The square root of 135124123 is about 11624.2902148905. The cubic root of 135124123 is about 513.1499560984.

Adding to 135124123 its reverse (321421531), we get a palindrome (456545654).

The spelling of 135124123 in words is "one hundred thirty-five million, one hundred twenty-four thousand, one hundred twenty-three".