43243561431 has 12 divisors (see below), whose sum is σ = 71386196752. Its totient is φ = 24710606496.

The previous prime is 43243561397. The next prime is 43243561441. The reversal of 43243561431 is 13416534234.

43243561431 is a `hidden beast` number, since 4 + 3 + 2 + 4 + 3 + 5 + 614 + 31 = 666.

It is not a de Polignac number, because 43243561431 - 2¹⁰ = 43243560407 is a prime.

It is a super-2 number, since 2×43243561431² (a number of 22 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 (43243561441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 343202806 + ... + 343202931.

Almost surely, 2^43243561431 is an apocalyptic number.

43243561431 is a deficient number, since it is larger than the sum of its proper divisors (28142635321).

43243561431 is a wasteful number, since it uses less digits than its factorization.

43243561431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686405750 (or 686405747 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The spelling of 43243561431 in words is "forty-three billion, two hundred forty-three million, five hundred sixty-one thousand, four hundred thirty-one".