25390649 has 2 divisors, whose sum is σ = 25390650. Its totient is φ = 25390648.

The previous prime is 25390637. The next prime is 25390661. The reversal of 25390649 is 94609352.

It is a balanced prime because it is at equal distance from previous prime (25390637) and next prime (25390661).

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 4276624 = 4595^2 + 2068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25390649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25390699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12695324 + 12695325.

It is an arithmetic number, because the mean of its divisors is an integer number (12695325).

Almost surely, 2^25390649 is an apocalyptic number.

It is an amenable number.

25390649 is a deficient number, since it is larger than the sum of its proper divisors (1).

25390649 is an equidigital number, since it uses as much as digits as its factorization.

25390649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 25390649 is about 5038.9134741529. The cubic root of 25390649 is about 293.9169285715.

The spelling of 25390649 in words is "twenty-five million, three hundred ninety thousand, six hundred forty-nine".