25609249 has 2 divisors, whose sum is σ = 25609250. Its totient is φ = 25609248.

The previous prime is 25609247. The next prime is 25609267. The reversal of 25609249 is 94290652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17808400 + 7800849 = 4220^2 + 2793^2 .

It is a cyclic number.

It is not a de Polignac number, because 25609249 - 2¹ = 25609247 is a prime.

Together with 25609247, 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 (25609247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12804624 + 12804625.

It is an arithmetic number, because the mean of its divisors is an integer number (12804625).

Almost surely, 2^25609249 is an apocalyptic number.

It is an amenable number.

25609249 is a deficient number, since it is larger than the sum of its proper divisors (1).

25609249 is an equidigital number, since it uses as much as digits as its factorization.

25609249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 25609249 is about 5060.5581707950. The cubic root of 25609249 is about 294.7580089586.

The spelling of 25609249 in words is "twenty-five million, six hundred nine thousand, two hundred forty-nine".