2565521 has 8 divisors (see below), whose sum is σ = 3104640. Its totient is φ = 2069568.

The previous prime is 2565463. The next prime is 2565559. The reversal of 2565521 is 1255652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2565521 - 2¹⁸ = 2303377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2565221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10661 + ... + 10898.

It is an arithmetic number, because the mean of its divisors is an integer number (388080).

2^2565521 is an apocalyptic number.

It is an amenable number.

2565521 is a deficient number, since it is larger than the sum of its proper divisors (539119).

2565521 is a wasteful number, since it uses less digits than its factorization.

2565521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21583.

The product of its digits is 3000, while the sum is 26.

The square root of 2565521 is about 1601.7243832820. The cubic root of 2565521 is about 136.8963465522.

The spelling of 2565521 in words is "two million, five hundred sixty-five thousand, five hundred twenty-one".