25648009 has 2 divisors, whose sum is σ = 25648010. Its totient is φ = 25648008.

The previous prime is 25648003. The next prime is 25648033. The reversal of 25648009 is 90084652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23765625 + 1882384 = 4875^2 + 1372^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25648009 is a prime.

It is not a weakly prime, because it can be changed into another prime (25648003) 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, 12824004 + 12824005.

It is an arithmetic number, because the mean of its divisors is an integer number (12824005).

Almost surely, 2^25648009 is an apocalyptic number.

It is an amenable number.

25648009 is a deficient number, since it is larger than the sum of its proper divisors (1).

25648009 is an equidigital number, since it uses as much as digits as its factorization.

25648009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 25648009 is about 5064.3863399231. The cubic root of 25648009 is about 294.9066409546.

The spelling of 25648009 in words is "twenty-five million, six hundred forty-eight thousand, nine".