2009543 has 2 divisors, whose sum is σ = 2009544. Its totient is φ = 2009542.

The previous prime is 2009537. The next prime is 2009593. The reversal of 2009543 is 3459002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2009543 - 2¹² = 2005447 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 (2009503) 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, 1004771 + 1004772.

It is an arithmetic number, because the mean of its divisors is an integer number (1004772).

2^2009543 is an apocalyptic number.

2009543 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009543 is an equidigital number, since it uses as much as digits as its factorization.

2009543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 2009543 is about 1417.5835072404. The cubic root of 2009543 is about 126.1921775537.

It can be divided in two parts, 2009 and 543, that added together give a palindrome (2552).

The spelling of 2009543 in words is "two million, nine thousand, five hundred forty-three".