25981585 has 16 divisors (see below), whose sum is σ = 36596736. Its totient is φ = 17333568.

The previous prime is 25981537. The next prime is 25981591. The reversal of 25981585 is 58518952.

It is a de Polignac number, because none of the positive numbers 2^k-25981585 is a prime.

It is a super-2 number, since 2×25981585² = 1350085518224450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8737 + ... + 11326.

It is an arithmetic number, because the mean of its divisors is an integer number (2287296).

Almost surely, 2^25981585 is an apocalyptic number.

It is an amenable number.

25981585 is a deficient number, since it is larger than the sum of its proper divisors (10615151).

25981585 is a wasteful number, since it uses less digits than its factorization.

25981585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20112.

The product of its digits is 144000, while the sum is 43.

The square root of 25981585 is about 5097.2134544278. The cubic root of 25981585 is about 296.1796488280.

The spelling of 25981585 in words is "twenty-five million, nine hundred eighty-one thousand, five hundred eighty-five".