123312305312431 has 4 divisors (see below), whose sum is σ = 127290121612864. Its totient is φ = 119334489012000.

The previous prime is 123312305312407. The next prime is 123312305312453. The reversal of 123312305312431 is 134213503213321.

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

It is a cyclic number.

It is not a de Polignac number, because 123312305312431 - 2⁷ = 123312305312303 is a prime.

It is a super-2 number, since 2×123312305312431² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123312305312461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1988908150170 + ... + 1988908150231.

It is an arithmetic number, because the mean of its divisors is an integer number (31822530403216).

Almost surely, 2^{123312305312431} is an apocalyptic number.

123312305312431 is a deficient number, since it is larger than the sum of its proper divisors (3977816300433).

123312305312431 is an equidigital number, since it uses as much as digits as its factorization.

123312305312431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977816300432.

The product of its (nonzero) digits is 38880, while the sum is 34.

Adding to 123312305312431 its reverse (134213503213321), we get a palindrome (257525808525752).

The spelling of 123312305312431 in words is "one hundred twenty-three trillion, three hundred twelve billion, three hundred five million, three hundred twelve thousand, four hundred thirty-one".