2643559 has 2 divisors, whose sum is σ = 2643560. Its totient is φ = 2643558.

The previous prime is 2643547. The next prime is 2643569. The reversal of 2643559 is 9553462.

2643559 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 is a cyclic number.

It is not a de Polignac number, because 2643559 - 2¹⁵ = 2610791 is a prime.

2643559 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2643569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321779 + 1321780.

It is an arithmetic number, because the mean of its divisors is an integer number (1321780).

2^2643559 is an apocalyptic number.

2643559 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643559 is an equidigital number, since it uses as much as digits as its factorization.

2643559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 2643559 is about 1625.9025186031. The cubic root of 2643559 is about 138.2705432686.

Subtracting 2643559 from its reverse (9553462), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2643559 in words is "two million, six hundred forty-three thousand, five hundred fifty-nine".