25085309 has 2 divisors, whose sum is σ = 25085310. Its totient is φ = 25085308.

The previous prime is 25085279. The next prime is 25085311. The reversal of 25085309 is 90358052.

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., 15382084 + 9703225 = 3922^2 + 3115^2 .

It is a cyclic number.

It is not a de Polignac number, because 25085309 - 2¹² = 25081213 is a prime.

Together with 25085311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25085329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12542654 + 12542655.

It is an arithmetic number, because the mean of its divisors is an integer number (12542655).

Almost surely, 2^25085309 is an apocalyptic number.

It is an amenable number.

25085309 is a deficient number, since it is larger than the sum of its proper divisors (1).

25085309 is an equidigital number, since it uses as much as digits as its factorization.

25085309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 25085309 is about 5008.5236347650. The cubic root of 25085309 is about 292.7339895997.

The spelling of 25085309 in words is "twenty-five million, eighty-five thousand, three hundred nine".