25806013 has 2 divisors, whose sum is σ = 25806014. Its totient is φ = 25806012.

The previous prime is 25805987. The next prime is 25806059. The reversal of 25806013 is 31060852.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15578809 + 10227204 = 3947^2 + 3198^2 .

It is a cyclic number.

It is not a de Polignac number, because 25806013 - 2¹⁷ = 25674941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25806073) 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, 12903006 + 12903007.

It is an arithmetic number, because the mean of its divisors is an integer number (12903007).

Almost surely, 2^25806013 is an apocalyptic number.

It is an amenable number.

25806013 is a deficient number, since it is larger than the sum of its proper divisors (1).

25806013 is an equidigital number, since it uses as much as digits as its factorization.

25806013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 25806013 is about 5079.9619093060. The cubic root of 25806013 is about 295.5109902645.

Adding to 25806013 its reverse (31060852), we get a palindrome (56866865).

The spelling of 25806013 in words is "twenty-five million, eight hundred six thousand, thirteen".