25798649 has 2 divisors, whose sum is σ = 25798650. Its totient is φ = 25798648.

The previous prime is 25798601. The next prime is 25798687. The reversal of 25798649 is 94689752.

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., 16605625 + 9193024 = 4075^2 + 3032^2 .

It is a cyclic number.

It is not a de Polignac number, because 25798649 - 2⁸ = 25798393 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25798597 and 25798606.

It is not a weakly prime, because it can be changed into another prime (25798049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12899324 + 12899325.

It is an arithmetic number, because the mean of its divisors is an integer number (12899325).

Almost surely, 2^25798649 is an apocalyptic number.

It is an amenable number.

25798649 is a deficient number, since it is larger than the sum of its proper divisors (1).

25798649 is an equidigital number, since it uses as much as digits as its factorization.

25798649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The square root of 25798649 is about 5079.2370490065. The cubic root of 25798649 is about 295.4828785997.

The spelling of 25798649 in words is "twenty-five million, seven hundred ninety-eight thousand, six hundred forty-nine".