43328321 has 2 divisors, whose sum is σ = 43328322. Its totient is φ = 43328320.

The previous prime is 43328273. The next prime is 43328423. The reversal of 43328321 is 12382334.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27615025 + 15713296 = 5255^2 + 3964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43328321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43327321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21664160 + 21664161.

It is an arithmetic number, because the mean of its divisors is an integer number (21664161).

Almost surely, 2^43328321 is an apocalyptic number.

It is an amenable number.

43328321 is a deficient number, since it is larger than the sum of its proper divisors (1).

43328321 is an equidigital number, since it uses as much as digits as its factorization.

43328321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 26.

The square root of 43328321 is about 6582.4251609874. The cubic root of 43328321 is about 351.2292044949.

The spelling of 43328321 in words is "forty-three million, three hundred twenty-eight thousand, three hundred twenty-one".