231433044138 has 12 divisors (see below), whose sum is σ = 501438262338. Its totient is φ = 77144348040.

The previous prime is 231433044137. The next prime is 231433044151. The reversal of 231433044138 is 831440334132.

231433044138 is a `hidden beast` number, since 2 + 314 + 3 + 304 + 4 + 1 + 38 = 666.

It can be written as a sum of positive squares in only one way, i.e., 215753747049 + 15679297089 = 464493^2 + 125217^2 .

It is a super-2 number, since 2×231433044138² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231433044137) 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 5 ways as a sum of consecutive naturals, for example, 6428695653 + ... + 6428695688.

Almost surely, 2^231433044138 is an apocalyptic number.

231433044138 is an abundant number, since it is smaller than the sum of its proper divisors (270005218200).

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

231433044138 is a wasteful number, since it uses less digits than its factorization.

231433044138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12857391349 (or 12857391346 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 231433044138 in words is "two hundred thirty-one billion, four hundred thirty-three million, forty-four thousand, one hundred thirty-eight".