2565139 has 2 divisors, whose sum is σ = 2565140. Its totient is φ = 2565138.

The previous prime is 2565109. The next prime is 2565149. The reversal of 2565139 is 9315652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2565139 - 2¹⁹ = 2040851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2565139.

It is not a weakly prime, because it can be changed into another prime (2565109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282569 + 1282570.

It is an arithmetic number, because the mean of its divisors is an integer number (1282570).

2^2565139 is an apocalyptic number.

2565139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565139 is an equidigital number, since it uses as much as digits as its factorization.

2565139 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 2565139 is about 1601.6051323594. The cubic root of 2565139 is about 136.8895517010.

It can be divided in two parts, 2565 and 139, that added together give a square (2704 = 52²).

The spelling of 2565139 in words is "two million, five hundred sixty-five thousand, one hundred thirty-nine".