2565523 has 4 divisors (see below), whose sum is σ = 2584120. Its totient is φ = 2546928.

The previous prime is 2565463. The next prime is 2565559. The reversal of 2565523 is 3255652.

2565523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2565523 - 2²¹ = 468371 is a prime.

It is a super-4 number, since 4×2565523⁴ (a number of 27 digits) contains 4444 as substring.

It is a Duffinian number.

2565523 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2565491 and 2565500.

It is not an unprimeable number, because it can be changed into a prime (2565593) 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 in 3 ways as a sum of consecutive naturals, for example, 9090 + ... + 9367.

It is an arithmetic number, because the mean of its divisors is an integer number (646030).

2^2565523 is an apocalyptic number.

2565523 is a deficient number, since it is larger than the sum of its proper divisors (18597).

2565523 is a wasteful number, since it uses less digits than its factorization.

2565523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18596.

The product of its digits is 9000, while the sum is 28.

The square root of 2565523 is about 1601.7250076090. The cubic root of 2565523 is about 136.8963821256.

The spelling of 2565523 in words is "two million, five hundred sixty-five thousand, five hundred twenty-three".