25825309 has 2 divisors, whose sum is σ = 25825310. Its totient is φ = 25825308.

The previous prime is 25825279. The next prime is 25825333. The reversal of 25825309 is 90352852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 120409 = 5070^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 25825309 - 2⁵ = 25825277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25825339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12912654 + 12912655.

It is an arithmetic number, because the mean of its divisors is an integer number (12912655).

Almost surely, 2^25825309 is an apocalyptic number.

It is an amenable number.

25825309 is a deficient number, since it is larger than the sum of its proper divisors (1).

25825309 is an equidigital number, since it uses as much as digits as its factorization.

25825309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 25825309 is about 5081.8607812493. The cubic root of 25825309 is about 295.5846263252.

The spelling of 25825309 in words is "twenty-five million, eight hundred twenty-five thousand, three hundred nine".