43456909 has 2 divisors, whose sum is σ = 43456910. Its totient is φ = 43456908.

The previous prime is 43456871. The next prime is 43456921. The reversal of 43456909 is 90965434.

43456909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37478884 + 5978025 = 6122^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 43456909 - 2¹⁷ = 43325837 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43456939) 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, 21728454 + 21728455.

It is an arithmetic number, because the mean of its divisors is an integer number (21728455).

Almost surely, 2^43456909 is an apocalyptic number.

It is an amenable number.

43456909 is a deficient number, since it is larger than the sum of its proper divisors (1).

43456909 is an equidigital number, since it uses as much as digits as its factorization.

43456909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 43456909 is about 6592.1854494545. The cubic root of 43456909 is about 351.5763158449.

The spelling of 43456909 in words is "forty-three million, four hundred fifty-six thousand, nine hundred nine".