43437221 has 2 divisors, whose sum is σ = 43437222. Its totient is φ = 43437220.

The previous prime is 43437209. The next prime is 43437257. The reversal of 43437221 is 12273434.

43437221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28890625 + 14546596 = 5375^2 + 3814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43437221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43437721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21718610 + 21718611.

It is an arithmetic number, because the mean of its divisors is an integer number (21718611).

Almost surely, 2^43437221 is an apocalyptic number.

It is an amenable number.

43437221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43437221 is an equidigital number, since it uses as much as digits as its factorization.

43437221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 26.

The square root of 43437221 is about 6590.6919970516. The cubic root of 43437221 is about 351.5232143532.

The spelling of 43437221 in words is "forty-three million, four hundred thirty-seven thousand, two hundred twenty-one".