42531123231 has 24 divisors (see below), whose sum is σ = 62138119680. Its totient is φ = 28030145616.

The previous prime is 42531123191. The next prime is 42531123247. The reversal of 42531123231 is 13232113524.

42531123231 is a `hidden beast` number, since 4 + 2 + 531 + 123 + 2 + 3 + 1 = 666.

It is not a de Polignac number, because 42531123231 - 2²⁶ = 42464014367 is a prime.

It is a super-2 number, since 2×42531123231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42531123195 and 42531123204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42531123031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 415176 + ... + 507378.

It is an arithmetic number, because the mean of its divisors is an integer number (2589088320).

Almost surely, 2^42531123231 is an apocalyptic number.

42531123231 is a deficient number, since it is larger than the sum of its proper divisors (19606996449).

42531123231 is a wasteful number, since it uses less digits than its factorization.

42531123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92795 (or 92792 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

Adding to 42531123231 its reverse (13232113524), we get a palindrome (55763236755).

The spelling of 42531123231 in words is "forty-two billion, five hundred thirty-one million, one hundred twenty-three thousand, two hundred thirty-one".