2565511 has 4 divisors (see below), whose sum is σ = 2762872. Its totient is φ = 2368152.

The previous prime is 2565463. The next prime is 2565559. The reversal of 2565511 is 1155652.

2565511 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 an interprime number because it is at equal distance from previous prime (2565463) and next prime (2565559).

It is a cyclic number.

It is not a de Polignac number, because 2565511 - 2⁷ = 2565383 is a prime.

It is a super-2 number, since 2×2565511² = 13163693382242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565611) 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, 98661 + ... + 98686.

It is an arithmetic number, because the mean of its divisors is an integer number (690718).

2^2565511 is an apocalyptic number.

2565511 is a deficient number, since it is larger than the sum of its proper divisors (197361).

2565511 is a wasteful number, since it uses less digits than its factorization.

2565511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197360.

The product of its digits is 1500, while the sum is 25.

The square root of 2565511 is about 1601.7212616432. The cubic root of 2565511 is about 136.8961686851.

It can be divided in two parts, 25 and 65511, that added together give a 16-th power (65536 = 2¹⁶).

The spelling of 2565511 in words is "two million, five hundred sixty-five thousand, five hundred eleven".