25284821 has 2 divisors, whose sum is σ = 25284822. Its totient is φ = 25284820.

The previous prime is 25284793. The next prime is 25284841. The reversal of 25284821 is 12848252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16200625 + 9084196 = 4025^2 + 3014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25284821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25284841) 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, 12642410 + 12642411.

It is an arithmetic number, because the mean of its divisors is an integer number (12642411).

Almost surely, 2^25284821 is an apocalyptic number.

It is an amenable number.

25284821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25284821 is an equidigital number, since it uses as much as digits as its factorization.

25284821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10240, while the sum is 32.

The square root of 25284821 is about 5028.4014358442. The cubic root of 25284821 is about 293.5080122065.

The spelling of 25284821 in words is "twenty-five million, two hundred eighty-four thousand, eight hundred twenty-one".