43431594938 has 4 divisors (see below), whose sum is σ = 65147392410. Its totient is φ = 21715797468.

The previous prime is 43431594929. The next prime is 43431595049. The reversal of 43431594938 is 83949513434.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 43279393369 + 152201569 = 208037^2 + 12337^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 43431594938.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10857898733 + ... + 10857898736.

Almost surely, 2^43431594938 is an apocalyptic number.

43431594938 is a deficient number, since it is larger than the sum of its proper divisors (21715797472).

43431594938 is a wasteful number, since it uses less digits than its factorization.

43431594938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21715797471.

The product of its digits is 5598720, while the sum is 53.

The spelling of 43431594938 in words is "forty-three billion, four hundred thirty-one million, five hundred ninety-four thousand, nine hundred thirty-eight".