2565391 has 2 divisors, whose sum is σ = 2565392. Its totient is φ = 2565390.

The previous prime is 2565389. The next prime is 2565403. The reversal of 2565391 is 1935652.

2565391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2565391 - 2¹ = 2565389 is a prime.

Together with 2565389, it forms a pair of twin primes.

It is a Chen prime.

2565391 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2565191) 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, 1282695 + 1282696.

It is an arithmetic number, because the mean of its divisors is an integer number (1282696).

2^2565391 is an apocalyptic number.

2565391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565391 is an equidigital number, since it uses as much as digits as its factorization.

2565391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 31.

The square root of 2565391 is about 1601.6838015039. The cubic root of 2565391 is about 136.8940342440.

The spelling of 2565391 in words is "two million, five hundred sixty-five thousand, three hundred ninety-one".