25848209 has 2 divisors, whose sum is σ = 25848210. Its totient is φ = 25848208.

The previous prime is 25848197. The next prime is 25848217. The reversal of 25848209 is 90284852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 7997584 = 4225^2 + 2828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25848209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25848239) 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, 12924104 + 12924105.

It is an arithmetic number, because the mean of its divisors is an integer number (12924105).

Almost surely, 2^25848209 is an apocalyptic number.

It is an amenable number.

25848209 is a deficient number, since it is larger than the sum of its proper divisors (1).

25848209 is an equidigital number, since it uses as much as digits as its factorization.

25848209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 25848209 is about 5084.1133937000. The cubic root of 25848209 is about 295.6719681418.

The spelling of 25848209 in words is "twenty-five million, eight hundred forty-eight thousand, two hundred nine".