123135455 has 4 divisors (see below), whose sum is σ = 147762552. Its totient is φ = 98508360.

The previous prime is 123135449. The next prime is 123135457. The reversal of 123135455 is 554531321.

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

It is not a de Polignac number, because 123135455 - 2⁶ = 123135391 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 (123135457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12313541 + ... + 12313550.

It is an arithmetic number, because the mean of its divisors is an integer number (36940638).

Almost surely, 2^123135455 is an apocalyptic number.

123135455 is a deficient number, since it is larger than the sum of its proper divisors (24627097).

123135455 is an equidigital number, since it uses as much as digits as its factorization.

123135455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24627096.

The product of its digits is 9000, while the sum is 29.

The square root of 123135455 is about 11096.6416090635. The cubic root of 123135455 is about 497.5014755476.

Adding to 123135455 its reverse (554531321), we get a palindrome (677666776).

The spelling of 123135455 in words is "one hundred twenty-three million, one hundred thirty-five thousand, four hundred fifty-five".