43744121 has 2 divisors, whose sum is σ = 43744122. Its totient is φ = 43744120.

The previous prime is 43744097. The next prime is 43744163. The reversal of 43744121 is 12144734.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34810000 + 8934121 = 5900^2 + 2989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43744121 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (43744721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21872060 + 21872061.

It is an arithmetic number, because the mean of its divisors is an integer number (21872061).

Almost surely, 2^43744121 is an apocalyptic number.

It is an amenable number.

43744121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43744121 is an equidigital number, since it uses as much as digits as its factorization.

43744121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 26.

The square root of 43744121 is about 6613.9338521035. The cubic root of 43744121 is about 352.3491526317.

Adding to 43744121 its reverse (12144734), we get a palindrome (55888855).

The spelling of 43744121 in words is "forty-three million, seven hundred forty-four thousand, one hundred twenty-one".