231312123 has 24 divisors (see below), whose sum is σ = 392172768. Its totient is φ = 128604672.

The previous prime is 231312121. The next prime is 231312139. The reversal of 231312123 is 321213132.

231312123 is a `hidden beast` number, since 231 + 312 + 123 = 666.

It is not a de Polignac number, because 231312123 - 2¹ = 231312121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231312096 and 231312105.

It is not an unprimeable number, because it can be changed into a prime (231312121) 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 23 ways as a sum of consecutive naturals, for example, 47286 + ... + 51947.

It is an arithmetic number, because the mean of its divisors is an integer number (16340532).

Almost surely, 2^231312123 is an apocalyptic number.

231312123 is a deficient number, since it is larger than the sum of its proper divisors (160860645).

231312123 is a wasteful number, since it uses less digits than its factorization.

231312123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99283 (or 99280 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 231312123 is about 15208.9487802412. The cubic root of 231312123 is about 613.8554719649.

Adding to 231312123 its reverse (321213132), we get a palindrome (552525255).

The spelling of 231312123 in words is "two hundred thirty-one million, three hundred twelve thousand, one hundred twenty-three".