2257709 has 2 divisors, whose sum is σ = 2257710. Its totient is φ = 2257708.

The previous prime is 2257693. The next prime is 2257721. The reversal of 2257709 is 9077522.

2257709 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., 1612900 + 644809 = 1270^2 + 803^2 .

It is a cyclic number.

It is not a de Polignac number, because 2257709 - 2⁴ = 2257693 is a prime.

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 (2257799) 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, 1128854 + 1128855.

It is an arithmetic number, because the mean of its divisors is an integer number (1128855).

2^2257709 is an apocalyptic number.

It is an amenable number.

2257709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2257709 is an equidigital number, since it uses as much as digits as its factorization.

2257709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 2257709 is about 1502.5674693670. The cubic root of 2257709 is about 131.1865531591.

The spelling of 2257709 in words is "two million, two hundred fifty-seven thousand, seven hundred nine".