25989289 has 2 divisors, whose sum is σ = 25989290. Its totient is φ = 25989288.

The previous prime is 25989251. The next prime is 25989317. The reversal of 25989289 is 98298952.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 4875264 = 4595^2 + 2208^2 .

It is a cyclic number.

It is not a de Polignac number, because 25989289 - 2⁹ = 25988777 is a prime.

It is not a weakly prime, because it can be changed into another prime (25983289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12994644 + 12994645.

It is an arithmetic number, because the mean of its divisors is an integer number (12994645).

Almost surely, 2^25989289 is an apocalyptic number.

It is an amenable number.

25989289 is a deficient number, since it is larger than the sum of its proper divisors (1).

25989289 is an equidigital number, since it uses as much as digits as its factorization.

25989289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 52.

The square root of 25989289 is about 5097.9691054380. The cubic root of 25989289 is about 296.2089201052.

The spelling of 25989289 in words is "twenty-five million, nine hundred eighty-nine thousand, two hundred eighty-nine".