2568641 has 2 divisors, whose sum is σ = 2568642. Its totient is φ = 2568640.

The previous prime is 2568623. The next prime is 2568653. The reversal of 2568641 is 1468652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2238016 + 330625 = 1496^2 + 575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2568641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2568598 and 2568607.

It is not a weakly prime, because it can be changed into another prime (2568541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284320 + 1284321.

It is an arithmetic number, because the mean of its divisors is an integer number (1284321).

2^2568641 is an apocalyptic number.

It is an amenable number.

2568641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2568641 is an equidigital number, since it uses as much as digits as its factorization.

2568641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 2568641 is about 1602.6980376852. The cubic root of 2568641 is about 136.9518185305.

The spelling of 2568641 in words is "two million, five hundred sixty-eight thousand, six hundred forty-one".