2561743 has 2 divisors, whose sum is σ = 2561744. Its totient is φ = 2561742.

The previous prime is 2561737. The next prime is 2561749. The reversal of 2561743 is 3471652.

It is a balanced prime because it is at equal distance from previous prime (2561737) and next prime (2561749).

It is a cyclic number.

It is not a de Polignac number, because 2561743 - 2⁹ = 2561231 is a prime.

2561743 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561749) 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, 1280871 + 1280872.

It is an arithmetic number, because the mean of its divisors is an integer number (1280872).

2^2561743 is an apocalyptic number.

2561743 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561743 is an equidigital number, since it uses as much as digits as its factorization.

2561743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 28.

The square root of 2561743 is about 1600.5445948177. The cubic root of 2561743 is about 136.8291154414.

Subtracting 2561743 from its reverse (3471652), we obtain a palindrome (909909).

The spelling of 2561743 in words is "two million, five hundred sixty-one thousand, seven hundred forty-three".