25648961 has 6 divisors (see below), whose sum is σ = 27773910. Its totient is φ = 23675808.

The previous prime is 25648951. The next prime is 25648969. The reversal of 25648961 is 16984652.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2310400 + 23338561 = 1520^2 + 4831^2 .

It is not a de Polignac number, because 25648961 - 2⁶ = 25648897 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 (25648969) 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 5 ways as a sum of consecutive naturals, for example, 75716 + ... + 76053.

It is an arithmetic number, because the mean of its divisors is an integer number (4628985).

Almost surely, 2^25648961 is an apocalyptic number.

It is an amenable number.

25648961 is a deficient number, since it is larger than the sum of its proper divisors (2124949).

25648961 is a wasteful number, since it uses less digits than its factorization.

25648961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151795 (or 151782 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 25648961 is about 5064.4803287208. The cubic root of 25648961 is about 294.9102896803.

The spelling of 25648961 in words is "twenty-five million, six hundred forty-eight thousand, nine hundred sixty-one".