2505521 has 4 divisors (see below), whose sum is σ = 2535792. Its totient is φ = 2475252.

The previous prime is 2505499. The next prime is 2505527. The reversal of 2505521 is 1255052.

2505521 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 2505521 - 2⁶ = 2505457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2505493 and 2505502.

It is not an unprimeable number, because it can be changed into a prime (2505527) 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, 15011 + ... + 15176.

It is an arithmetic number, because the mean of its divisors is an integer number (633948).

2^2505521 is an apocalyptic number.

It is an amenable number.

2505521 is a deficient number, since it is larger than the sum of its proper divisors (30271).

2505521 is an equidigital number, since it uses as much as digits as its factorization.

2505521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30270.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 2505521 is about 1582.8837607354. The cubic root of 2505521 is about 135.8207160382.

The spelling of 2505521 in words is "two million, five hundred five thousand, five hundred twenty-one".