123112313231 has 4 divisors (see below), whose sum is σ = 124307578512. Its totient is φ = 121917047952.

The previous prime is 123112313201. The next prime is 123112313239. The reversal of 123112313231 is 132313211321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132313211321 = 229 ⋅577786949.

It is a cyclic number.

It is not a de Polignac number, because 123112313231 - 2¹⁰ = 123112312207 is a prime.

It is a super-2 number, since 2×123112313231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123112313197 and 123112313206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123112313239) 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 3 ways as a sum of consecutive naturals, for example, 597632486 + ... + 597632691.

It is an arithmetic number, because the mean of its divisors is an integer number (31076894628).

Almost surely, 2^123112313231 is an apocalyptic number.

123112313231 is a deficient number, since it is larger than the sum of its proper divisors (1195265281).

123112313231 is a wasteful number, since it uses less digits than its factorization.

123112313231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195265280.

The product of its digits is 648, while the sum is 23.

Adding to 123112313231 its reverse (132313211321), we get a palindrome (255425524552).

The spelling of 123112313231 in words is "one hundred twenty-three billion, one hundred twelve million, three hundred thirteen thousand, two hundred thirty-one".