25532809 has 9 divisors (see below), whose sum is σ = 26545869. Its totient is φ = 24557580.

The previous prime is 25532779. The next prime is 25532821. The reversal of 25532809 is 90823552.

The square root of 25532809 is 5053.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 25532809 - 2⁷ = 25532681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25532869) 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 in 8 ways as a sum of consecutive naturals, for example, 156562 + ... + 156724.

It is an arithmetic number, because the mean of its divisors is an integer number (2949541).

Almost surely, 2^25532809 is an apocalyptic number.

25532809 is the 5053-rd square number.

25532809 is the 2527-th centered octagonal number.

It is an amenable number.

25532809 is a deficient number, since it is larger than the sum of its proper divisors (1013060).

25532809 is an frugal number, since it uses more digits than its factorization.

25532809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The cubic root of 25532809 is about 294.4644463081.

The spelling of 25532809 in words is "twenty-five million, five hundred thirty-two thousand, eight hundred nine".