25648191 has 16 divisors (see below), whose sum is σ = 39224320. Its totient is φ = 16546680.

The previous prime is 25648177. The next prime is 25648193. The reversal of 25648191 is 19184652.

25648191 is a `hidden beast` number, since 2 + 5 + 648 + 1 + 9 + 1 = 666.

It is not a de Polignac number, because 25648191 - 2²¹ = 23551039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25648193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14485 + ... + 16158.

It is an arithmetic number, because the mean of its divisors is an integer number (2451520).

Almost surely, 2^25648191 is an apocalyptic number.

25648191 is a deficient number, since it is larger than the sum of its proper divisors (13576129).

25648191 is a wasteful number, since it uses less digits than its factorization.

25648191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30683 (or 30677 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 25648191 is about 5064.4043085046. The cubic root of 25648191 is about 294.9073385121.

The spelling of 25648191 in words is "twenty-five million, six hundred forty-eight thousand, one hundred ninety-one".