25195609 has 2 divisors, whose sum is σ = 25195610. Its totient is φ = 25195608.

The previous prime is 25195601. The next prime is 25195613. The reversal of 25195609 is 90659152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14040009 + 11155600 = 3747^2 + 3340^2 .

It is a cyclic number.

It is not a de Polignac number, because 25195609 - 2³ = 25195601 is a prime.

It is not a weakly prime, because it can be changed into another prime (25195601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12597804 + 12597805.

It is an arithmetic number, because the mean of its divisors is an integer number (12597805).

Almost surely, 2^25195609 is an apocalyptic number.

It is an amenable number.

25195609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25195609 is an equidigital number, since it uses as much as digits as its factorization.

25195609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 25195609 is about 5019.5227860824. The cubic root of 25195609 is about 293.1624123351.

It can be divided in two parts, 2519 and 5609, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 25195609 in words is "twenty-five million, one hundred ninety-five thousand, six hundred nine".