123131122158 has 16 divisors (see below), whose sum is σ = 268649721216. Its totient is φ = 37312461240.

The previous prime is 123131122099. The next prime is 123131122159. The reversal of 123131122158 is 851221131321.

It is a super-2 number, since 2×123131122158² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131122159) 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 7 ways as a sum of consecutive naturals, for example, 932811466 + ... + 932811597.

It is an arithmetic number, because the mean of its divisors is an integer number (16790607576).

Almost surely, 2^123131122158 is an apocalyptic number.

123131122158 is an abundant number, since it is smaller than the sum of its proper divisors (145518599058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123131122158 is a wasteful number, since it uses less digits than its factorization.

123131122158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865623079.

The product of its digits is 2880, while the sum is 30.

Adding to 123131122158 its reverse (851221131321), we get a palindrome (974352253479).

The spelling of 123131122158 in words is "one hundred twenty-three billion, one hundred thirty-one million, one hundred twenty-two thousand, one hundred fifty-eight".