2045609 has 2 divisors, whose sum is σ = 2045610. Its totient is φ = 2045608.

The previous prime is 2045599. The next prime is 2045611. The reversal of 2045609 is 9065402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1651225 + 394384 = 1285^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 2045609 - 2¹⁶ = 1980073 is a prime.

Together with 2045611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2045629) 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, 1022804 + 1022805.

It is an arithmetic number, because the mean of its divisors is an integer number (1022805).

2^2045609 is an apocalyptic number.

It is an amenable number.

2045609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2045609 is an equidigital number, since it uses as much as digits as its factorization.

2045609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2045609 is about 1430.2478806137. The cubic root of 2045609 is about 126.9426446533.

The spelling of 2045609 in words is "two million, forty-five thousand, six hundred nine".