25198289 has 2 divisors, whose sum is σ = 25198290. Its totient is φ = 25198288.

The previous prime is 25198279. The next prime is 25198291. The reversal of 25198289 is 98289152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22963264 + 2235025 = 4792^2 + 1495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25198289 is a prime.

It is a Sophie Germain prime.

Together with 25198291, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25198249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12599144 + 12599145.

It is an arithmetic number, because the mean of its divisors is an integer number (12599145).

Almost surely, 2^25198289 is an apocalyptic number.

It is an amenable number.

25198289 is a deficient number, since it is larger than the sum of its proper divisors (1).

25198289 is an equidigital number, since it uses as much as digits as its factorization.

25198289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 44.

The square root of 25198289 is about 5019.7897366324. The cubic root of 25198289 is about 293.1728063077.

The spelling of 25198289 in words is "twenty-five million, one hundred ninety-eight thousand, two hundred eighty-nine".