4043509 has 2 divisors, whose sum is σ = 4043510. Its totient is φ = 4043508.

The previous prime is 4043503. The next prime is 4043513. The reversal of 4043509 is 9053404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3900625 + 142884 = 1975^2 + 378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4043509 is a prime.

It is a super-3 number, since 3×4043509³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4043503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021754 + 2021755.

It is an arithmetic number, because the mean of its divisors is an integer number (2021755).

Almost surely, 2^4043509 is an apocalyptic number.

It is an amenable number.

4043509 is a deficient number, since it is larger than the sum of its proper divisors (1).

4043509 is an equidigital number, since it uses as much as digits as its factorization.

4043509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 4043509 is about 2010.8478311399. The cubic root of 4043509 is about 159.3135828455.

The spelling of 4043509 in words is "four million, forty-three thousand, five hundred nine".