2456521 has 4 divisors (see below), whose sum is σ = 2460544. Its totient is φ = 2452500.

The previous prime is 2456501. The next prime is 2456539. The reversal of 2456521 is 1256542.

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 2456521 - 2¹⁵ = 2423753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2456501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885 + ... + 2386.

It is an arithmetic number, because the mean of its divisors is an integer number (615136).

2^2456521 is an apocalyptic number.

It is an amenable number.

2456521 is a deficient number, since it is larger than the sum of its proper divisors (4023).

2456521 is an equidigital number, since it uses as much as digits as its factorization.

2456521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022.

The product of its digits is 2400, while the sum is 25.

The square root of 2456521 is about 1567.3292570484. The cubic root of 2456521 is about 134.9294739078.

The spelling of 2456521 in words is "two million, four hundred fifty-six thousand, five hundred twenty-one".