25306289 has 2 divisors, whose sum is σ = 25306290. Its totient is φ = 25306288.

The previous prime is 25306283. The next prime is 25306291. The reversal of 25306289 is 98260352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21464689 + 3841600 = 4633^2 + 1960^2 .

It is a cyclic number.

It is not a de Polignac number, because 25306289 - 2⁴ = 25306273 is a prime.

Together with 25306291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25306283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12653144 + 12653145.

It is an arithmetic number, because the mean of its divisors is an integer number (12653145).

Almost surely, 2^25306289 is an apocalyptic number.

It is an amenable number.

25306289 is a deficient number, since it is larger than the sum of its proper divisors (1).

25306289 is an equidigital number, since it uses as much as digits as its factorization.

25306289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 25306289 is about 5030.5356573629. The cubic root of 25306289 is about 293.5910560684.

The spelling of 25306289 in words is "twenty-five million, three hundred six thousand, two hundred eighty-nine".