25896809 has 2 divisors, whose sum is σ = 25896810. Its totient is φ = 25896808.

The previous prime is 25896751. The next prime is 25896817. The reversal of 25896809 is 90869852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25000000 + 896809 = 5000^2 + 947^2 .

It is a cyclic number.

It is not a de Polignac number, because 25896809 - 2⁸ = 25896553 is a prime.

It is not a weakly prime, because it can be changed into another prime (25896869) 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, 12948404 + 12948405.

It is an arithmetic number, because the mean of its divisors is an integer number (12948405).

Almost surely, 2^25896809 is an apocalyptic number.

It is an amenable number.

25896809 is a deficient number, since it is larger than the sum of its proper divisors (1).

25896809 is an equidigital number, since it uses as much as digits as its factorization.

25896809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 25896809 is about 5088.8907435707. The cubic root of 25896809 is about 295.8571603547.

It can be divided in two parts, 25 and 896809, that multiplied together give a square (22420225 = 4735²).

The spelling of 25896809 in words is "twenty-five million, eight hundred ninety-six thousand, eight hundred nine".