2565517 has 4 divisors (see below), whose sum is σ = 2570400. Its totient is φ = 2560636.

The previous prime is 2565463. The next prime is 2565559. The reversal of 2565517 is 7155652.

2565517 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2565517 - 2⁷ = 2565389 is a prime.

It is a super-4 number, since 4×2565517⁴ (a number of 27 digits) contains 4444 as substring.

It is a Duffinian number.

2565517 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565917) 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, 1543 + ... + 2740.

It is an arithmetic number, because the mean of its divisors is an integer number (642600).

2^2565517 is an apocalyptic number.

It is an amenable number.

2565517 is a deficient number, since it is larger than the sum of its proper divisors (4883).

2565517 is an equidigital number, since it uses as much as digits as its factorization.

2565517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4882.

The product of its digits is 10500, while the sum is 31.

The square root of 2565517 is about 1601.7231346272. The cubic root of 2565517 is about 136.8962754054.

The spelling of 2565517 in words is "two million, five hundred sixty-five thousand, five hundred seventeen".