25528813 has 2 divisors, whose sum is σ = 25528814. Its totient is φ = 25528812.

The previous prime is 25528777. The next prime is 25528819. The reversal of 25528813 is 31882552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16305444 + 9223369 = 4038^2 + 3037^2 .

It is a cyclic number.

It is not a de Polignac number, because 25528813 - 2⁹ = 25528301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25528819) 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, 12764406 + 12764407.

It is an arithmetic number, because the mean of its divisors is an integer number (12764407).

Almost surely, 2^25528813 is an apocalyptic number.

It is an amenable number.

25528813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25528813 is an equidigital number, since it uses as much as digits as its factorization.

25528813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 34.

The square root of 25528813 is about 5052.6045758599. The cubic root of 25528813 is about 294.4490838344.

The spelling of 25528813 in words is "twenty-five million, five hundred twenty-eight thousand, eight hundred thirteen".