25288909 has 2 divisors, whose sum is σ = 25288910. Its totient is φ = 25288908.

The previous prime is 25288883. The next prime is 25288919. The reversal of 25288909 is 90988252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23068809 + 2220100 = 4803^2 + 1490^2 .

It is a cyclic number.

It is not a de Polignac number, because 25288909 - 2¹¹ = 25286861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25288919) 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, 12644454 + 12644455.

It is an arithmetic number, because the mean of its divisors is an integer number (12644455).

Almost surely, 2^25288909 is an apocalyptic number.

It is an amenable number.

25288909 is a deficient number, since it is larger than the sum of its proper divisors (1).

25288909 is an equidigital number, since it uses as much as digits as its factorization.

25288909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 25288909 is about 5028.8079104297. The cubic root of 25288909 is about 293.5238292863.

The spelling of 25288909 in words is "twenty-five million, two hundred eighty-eight thousand, nine hundred nine".