123136455 has 16 divisors (see below), whose sum is σ = 212173920. Its totient is φ = 60620928.

The previous prime is 123136451. The next prime is 123136471. The reversal of 123136455 is 554631321.

It is not a de Polignac number, because 123136455 - 2² = 123136451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123136451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315540 + ... + 315929.

It is an arithmetic number, because the mean of its divisors is an integer number (13260870).

Almost surely, 2^123136455 is an apocalyptic number.

123136455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123136455 is a deficient number, since it is larger than the sum of its proper divisors (89037465).

123136455 is a wasteful number, since it uses less digits than its factorization.

123136455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631490.

The product of its digits is 10800, while the sum is 30.

The square root of 123136455 is about 11096.6866676499. The cubic root of 123136455 is about 497.5028223033.

Adding to 123136455 its reverse (554631321), we get a palindrome (677767776).

The spelling of 123136455 in words is "one hundred twenty-three million, one hundred thirty-six thousand, four hundred fifty-five".