2521565 has 8 divisors (see below), whose sum is σ = 3068928. Its totient is φ = 1988560.

The previous prime is 2521537. The next prime is 2521591. The reversal of 2521565 is 5651252.

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

It is not a de Polignac number, because 2521565 - 2⁶ = 2521501 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3197 + ... + 3906.

It is an arithmetic number, because the mean of its divisors is an integer number (383616).

2^2521565 is an apocalyptic number.

It is an amenable number.

2521565 is a deficient number, since it is larger than the sum of its proper divisors (547363).

2521565 is an equidigital number, since it uses as much as digits as its factorization.

2521565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7179.

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

The square root of 2521565 is about 1587.9436387983. The cubic root of 2521565 is about 136.1100068709.

The spelling of 2521565 in words is "two million, five hundred twenty-one thousand, five hundred sixty-five".