2543684009 has 2 divisors, whose sum is σ = 2543684010. Its totient is φ = 2543684008.

The previous prime is 2543683999. The next prime is 2543684021. The reversal of 2543684009 is 9004863452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1330206784 + 1213477225 = 36472^2 + 34835^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543684009 - 2¹² = 2543679913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2543684309) 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, 1271842004 + 1271842005.

It is an arithmetic number, because the mean of its divisors is an integer number (1271842005).

Almost surely, 2^2543684009 is an apocalyptic number.

It is an amenable number.

2543684009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2543684009 is an equidigital number, since it uses as much as digits as its factorization.

2543684009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 2543684009 is about 50434.9482898516. The cubic root of 2543684009 is about 1365.0683161164.

The spelling of 2543684009 in words is "two billion, five hundred forty-three million, six hundred eighty-four thousand, nine".