2528821 has 2 divisors, whose sum is σ = 2528822. Its totient is φ = 2528820.

The previous prime is 2528819. The next prime is 2528831. The reversal of 2528821 is 1288252.

2528821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 1028196 = 1225^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 2528821 - 2¹ = 2528819 is a prime.

Together with 2528819, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2528821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2528831) 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 as a sum of consecutive naturals, namely, 1264410 + 1264411.

It is an arithmetic number, because the mean of its divisors is an integer number (1264411).

2^2528821 is an apocalyptic number.

It is an amenable number.

2528821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2528821 is an equidigital number, since it uses as much as digits as its factorization.

2528821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 28.

The square root of 2528821 is about 1590.2267133966. The cubic root of 2528821 is about 136.2404375636.

The spelling of 2528821 in words is "two million, five hundred twenty-eight thousand, eight hundred twenty-one".