25805869 has 2 divisors, whose sum is σ = 25805870. Its totient is φ = 25805868.

The previous prime is 25805863. The next prime is 25805947. The reversal of 25805869 is 96850852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17892900 + 7912969 = 4230^2 + 2813^2 .

It is a cyclic number.

It is not a de Polignac number, because 25805869 - 2⁹ = 25805357 is a prime.

It is a super-2 number, since 2×25805869² = 1331885749690322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25805863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12902934 + 12902935.

It is an arithmetic number, because the mean of its divisors is an integer number (12902935).

Almost surely, 2^25805869 is an apocalyptic number.

It is an amenable number.

25805869 is a deficient number, since it is larger than the sum of its proper divisors (1).

25805869 is an equidigital number, since it uses as much as digits as its factorization.

25805869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 25805869 is about 5079.9477359516. The cubic root of 25805869 is about 295.5104406037.

The spelling of 25805869 in words is "twenty-five million, eight hundred five thousand, eight hundred sixty-nine".