43043431 has 4 divisors (see below), whose sum is σ = 43077672. Its totient is φ = 43009192.

The previous prime is 43043411. The next prime is 43043443. The reversal of 43043431 is 13434034.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43043431 is a prime.

It is a super-2 number, since 2×43043431² = 3705473904503522, which 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 (43043411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15160 + ... + 17773.

It is an arithmetic number, because the mean of its divisors is an integer number (10769418).

Almost surely, 2^43043431 is an apocalyptic number.

43043431 is a deficient number, since it is larger than the sum of its proper divisors (34241).

43043431 is a wasteful number, since it uses less digits than its factorization.

43043431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34240.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 43043431 is about 6560.7492712342. The cubic root of 43043431 is about 350.4577168006.

Adding to 43043431 its reverse (13434034), we get a palindrome (56477465).

The spelling of 43043431 in words is "forty-three million, forty-three thousand, four hundred thirty-one".