25788821 has 2 divisors, whose sum is σ = 25788822. Its totient is φ = 25788820.

The previous prime is 25788803. The next prime is 25788827. The reversal of 25788821 is 12888752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13608721 + 12180100 = 3689^2 + 3490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25788821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25788827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12894410 + 12894411.

It is an arithmetic number, because the mean of its divisors is an integer number (12894411).

Almost surely, 2^25788821 is an apocalyptic number.

It is an amenable number.

25788821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25788821 is an equidigital number, since it uses as much as digits as its factorization.

25788821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71680, while the sum is 41.

The square root of 25788821 is about 5078.2694887137. The cubic root of 25788821 is about 295.4453524154.

The spelling of 25788821 in words is "twenty-five million, seven hundred eighty-eight thousand, eight hundred twenty-one".