25609289 has 2 divisors, whose sum is σ = 25609290. Its totient is φ = 25609288.

The previous prime is 25609267. The next prime is 25609307. The reversal of 25609289 is 98290652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25351225 + 258064 = 5035^2 + 508^2 .

It is a cyclic number.

It is not a de Polignac number, because 25609289 - 2⁸ = 25609033 is a prime.

It is not a weakly prime, because it can be changed into another prime (25609249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12804644 + 12804645.

It is an arithmetic number, because the mean of its divisors is an integer number (12804645).

Almost surely, 2^25609289 is an apocalyptic number.

It is an amenable number.

25609289 is a deficient number, since it is larger than the sum of its proper divisors (1).

25609289 is an equidigital number, since it uses as much as digits as its factorization.

25609289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 25609289 is about 5060.5621229267. The cubic root of 25609289 is about 294.7581624229.

The spelling of 25609289 in words is "twenty-five million, six hundred nine thousand, two hundred eighty-nine".