25825409 has 2 divisors, whose sum is σ = 25825410. Its totient is φ = 25825408.

The previous prime is 25825391. The next prime is 25825411. The reversal of 25825409 is 90452852.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22061809 + 3763600 = 4697^2 + 1940^2 .

It is a cyclic number.

It is not a de Polignac number, because 25825409 - 2⁸ = 25825153 is a prime.

Together with 25825411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25825309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12912704 + 12912705.

It is an arithmetic number, because the mean of its divisors is an integer number (12912705).

Almost surely, 2^25825409 is an apocalyptic number.

It is an amenable number.

25825409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25825409 is an equidigital number, since it uses as much as digits as its factorization.

25825409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 25825409 is about 5081.8706201555. The cubic root of 25825409 is about 295.5850078427.

The spelling of 25825409 in words is "twenty-five million, eight hundred twenty-five thousand, four hundred nine".