25585509 has 16 divisors (see below), whose sum is σ = 35569664. Its totient is φ = 16340400.

The previous prime is 25585481. The next prime is 25585523. The reversal of 25585509 is 90558552.

It is not a de Polignac number, because 25585509 - 2⁵ = 25585477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25585009) 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 in 15 ways as a sum of consecutive naturals, for example, 8244 + ... + 10914.

It is an arithmetic number, because the mean of its divisors is an integer number (2223104).

Almost surely, 2^25585509 is an apocalyptic number.

It is an amenable number.

25585509 is a deficient number, since it is larger than the sum of its proper divisors (9984155).

25585509 is a wasteful number, since it uses less digits than its factorization.

25585509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808.

The product of its (nonzero) digits is 90000, while the sum is 39.

The square root of 25585509 is about 5058.2120358878. The cubic root of 25585509 is about 294.6668997073. Note that the first 3 decimals are identical.

The spelling of 25585509 in words is "twenty-five million, five hundred eighty-five thousand, five hundred nine".