25853809 has 2 divisors, whose sum is σ = 25853810. Its totient is φ = 25853808.

The previous prime is 25853801. The next prime is 25853837. The reversal of 25853809 is 90835852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20903184 + 4950625 = 4572^2 + 2225^2 .

It is a cyclic number.

It is not a de Polignac number, because 25853809 - 2³ = 25853801 is a prime.

It is not a weakly prime, because it can be changed into another prime (25853801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12926904 + 12926905.

It is an arithmetic number, because the mean of its divisors is an integer number (12926905).

Almost surely, 2^25853809 is an apocalyptic number.

It is an amenable number.

25853809 is a deficient number, since it is larger than the sum of its proper divisors (1).

25853809 is an equidigital number, since it uses as much as digits as its factorization.

25853809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 25853809 is about 5084.6640990335. The cubic root of 25853809 is about 295.6933189888.

It can be divided in two parts, 25853 and 809, that added together give a palindrome (26662).

The spelling of 25853809 in words is "twenty-five million, eight hundred fifty-three thousand, eight hundred nine".