123551031520431 has 6 divisors (see below), whose sum is σ = 178462601085080. Its totient is φ = 82367354346948.

The previous prime is 123551031520429. The next prime is 123551031520549. The reversal of 123551031520431 is 134025130155321.

It is a happy number.

123551031520431 is a `hidden beast` number, since 1 + 2 + 3 + 55 + 10 + 31 + 520 + 43 + 1 = 666.

It is not a de Polignac number, because 123551031520431 - 2¹ = 123551031520429 is a prime.

It is a super-2 number, since 2×123551031520431² (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 (123551031522431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6863946195571 + ... + 6863946195588.

Almost surely, 2^{123551031520431} is an apocalyptic number.

123551031520431 is a deficient number, since it is larger than the sum of its proper divisors (54911569564649).

123551031520431 is a wasteful number, since it uses less digits than its factorization.

123551031520431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13727892391165 (or 13727892391162 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

Adding to 123551031520431 its reverse (134025130155321), we get a palindrome (257576161675752).

The spelling of 123551031520431 in words is "one hundred twenty-three trillion, five hundred fifty-one billion, thirty-one million, five hundred twenty thousand, four hundred thirty-one".