2528221 has 2 divisors, whose sum is σ = 2528222. Its totient is φ = 2528220.

The previous prime is 2528167. The next prime is 2528231. The reversal of 2528221 is 1228252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2528100 + 121 = 1590^2 + 11^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2528221 is a prime.

2528221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2528192 and 2528201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2528231) 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 as a sum of consecutive naturals, namely, 1264110 + 1264111.

It is an arithmetic number, because the mean of its divisors is an integer number (1264111).

2^2528221 is an apocalyptic number.

It is an amenable number.

2528221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2528221 is an equidigital number, since it uses as much as digits as its factorization.

2528221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 22.

The square root of 2528221 is about 1590.0380498592. The cubic root of 2528221 is about 136.2296616950.

The spelling of 2528221 in words is "two million, five hundred twenty-eight thousand, two hundred twenty-one".