2857609 has 2 divisors, whose sum is σ = 2857610. Its totient is φ = 2857608.

The previous prime is 2857579. The next prime is 2857633. The reversal of 2857609 is 9067582.

2857609 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., 2805625 + 51984 = 1675^2 + 228^2 .

It is a cyclic number.

It is not a de Polignac number, because 2857609 - 2⁹ = 2857097 is a prime.

2857609 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2857639) 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, 1428804 + 1428805.

It is an arithmetic number, because the mean of its divisors is an integer number (1428805).

2^2857609 is an apocalyptic number.

It is an amenable number.

2857609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2857609 is an equidigital number, since it uses as much as digits as its factorization.

2857609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 2857609 is about 1690.4463907501. The cubic root of 2857609 is about 141.9060576822.

The spelling of 2857609 in words is "two million, eight hundred fifty-seven thousand, six hundred nine".