2743561 has 2 divisors, whose sum is σ = 2743562. Its totient is φ = 2743560.

The previous prime is 2743549. The next prime is 2743567. The reversal of 2743561 is 1653472.

2743561 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 can be written as a sum of positive squares in only one way, i.e., 2742336 + 1225 = 1656^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 2743561 - 2¹¹ = 2741513 is a prime.

It is a Chen prime.

2743561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2743567) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1371780 + 1371781.

It is an arithmetic number, because the mean of its divisors is an integer number (1371781).

2^2743561 is an apocalyptic number.

It is an amenable number.

2743561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2743561 is an equidigital number, since it uses as much as digits as its factorization.

2743561 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 2743561 is about 1656.3698258541. The cubic root of 2743561 is about 139.9925336154.

It can be divided in two parts, 27435 and 61, that multiplied together give a triangular number (1673535 = T₁₈₂₉).

The spelling of 2743561 in words is "two million, seven hundred forty-three thousand, five hundred sixty-one".