43328561 has 4 divisors (see below), whose sum is σ = 43570800. Its totient is φ = 43086324.

The previous prime is 43328557. The next prime is 43328599. The reversal of 43328561 is 16582334.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43328561 - 2² = 43328557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43328161) 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, 120851 + ... + 121208.

It is an arithmetic number, because the mean of its divisors is an integer number (10892700).

Almost surely, 2^43328561 is an apocalyptic number.

It is an amenable number.

43328561 is a deficient number, since it is larger than the sum of its proper divisors (242239).

43328561 is a wasteful number, since it uses less digits than its factorization.

43328561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242238.

The product of its digits is 17280, while the sum is 32.

The square root of 43328561 is about 6582.4433913251. The cubic root of 43328561 is about 351.2298529918.

The spelling of 43328561 in words is "forty-three million, three hundred twenty-eight thousand, five hundred sixty-one".