2745209 has 2 divisors, whose sum is σ = 2745210. Its totient is φ = 2745208.

The previous prime is 2745179. The next prime is 2745229. The reversal of 2745209 is 9025472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2418025 + 327184 = 1555^2 + 572^2 .

It is a cyclic number.

It is not a de Polignac number, because 2745209 - 2⁸ = 2744953 is a prime.

It is not a weakly prime, because it can be changed into another prime (2745229) 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, 1372604 + 1372605.

It is an arithmetic number, because the mean of its divisors is an integer number (1372605).

2^2745209 is an apocalyptic number.

It is an amenable number.

2745209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2745209 is an equidigital number, since it uses as much as digits as its factorization.

2745209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 2745209 is about 1656.8672246140. The cubic root of 2745209 is about 140.0205582055.

The spelling of 2745209 in words is "two million, seven hundred forty-five thousand, two hundred nine".