2745581 has 2 divisors, whose sum is σ = 2745582. Its totient is φ = 2745580.

The previous prime is 2745571. The next prime is 2745607. The reversal of 2745581 is 1855472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2669956 + 75625 = 1634^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 2745581 - 2¹⁰ = 2744557 is a prime.

It is a super-2 number, since 2×2745581² = 15076430055122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2745521) 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, 1372790 + 1372791.

It is an arithmetic number, because the mean of its divisors is an integer number (1372791).

2^2745581 is an apocalyptic number.

It is an amenable number.

2745581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2745581 is an equidigital number, since it uses as much as digits as its factorization.

2745581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11200, while the sum is 32.

The square root of 2745581 is about 1656.9794808627. The cubic root of 2745581 is about 140.0268825928.

The spelling of 2745581 in words is "two million, seven hundred forty-five thousand, five hundred eighty-one".