2543855609 has 2 divisors, whose sum is σ = 2543855610. Its totient is φ = 2543855608.

The previous prime is 2543855599. The next prime is 2543855687. The reversal of 2543855609 is 9065583452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1471489600 + 1072366009 = 38360^2 + 32747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2543855609 is a prime.

It is not a weakly prime, because it can be changed into another prime (2543854609) 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, 1271927804 + 1271927805.

It is an arithmetic number, because the mean of its divisors is an integer number (1271927805).

Almost surely, 2^2543855609 is an apocalyptic number.

It is an amenable number.

2543855609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2543855609 is an equidigital number, since it uses as much as digits as its factorization.

2543855609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296000, while the sum is 47.

The square root of 2543855609 is about 50436.6494624693. The cubic root of 2543855609 is about 1365.0990118127.

The spelling of 2543855609 in words is "two billion, five hundred forty-three million, eight hundred fifty-five thousand, six hundred nine".