123135154 has 4 divisors (see below), whose sum is σ = 184702734. Its totient is φ = 61567576.

The previous prime is 123135137. The next prime is 123135179. The reversal of 123135154 is 451531321.

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: 451531321 = 347 ⋅1301243.

It can be written as a sum of positive squares in only one way, i.e., 120494529 + 2640625 = 10977^2 + 1625^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30783787 + ... + 30783790.

Almost surely, 2^123135154 is an apocalyptic number.

123135154 is a deficient number, since it is larger than the sum of its proper divisors (61567580).

123135154 is an equidigital number, since it uses as much as digits as its factorization.

123135154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61567579.

The product of its digits is 1800, while the sum is 25.

The square root of 123135154 is about 11096.6280463932. The cubic root of 123135154 is about 497.5010701727.

Adding to 123135154 its reverse (451531321), we get a palindrome (574666475).

The spelling of 123135154 in words is "one hundred twenty-three million, one hundred thirty-five thousand, one hundred fifty-four".