2565221 has 2 divisors, whose sum is σ = 2565222. Its totient is φ = 2565220.

The previous prime is 2565203. The next prime is 2565239. The reversal of 2565221 is 1225652.

It is a balanced prime because it is at equal distance from previous prime (2565203) and next prime (2565239).

It can be written as a sum of positive squares in only one way, i.e., 2217121 + 348100 = 1489^2 + 590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2565221 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 (2525221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282610 + 1282611.

It is an arithmetic number, because the mean of its divisors is an integer number (1282611).

2^2565221 is an apocalyptic number.

It is an amenable number.

2565221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565221 is an equidigital number, since it uses as much as digits as its factorization.

2565221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 23.

The square root of 2565221 is about 1601.6307314734. The cubic root of 2565221 is about 136.8910103385.

The spelling of 2565221 in words is "two million, five hundred sixty-five thousand, two hundred twenty-one".