25856489 has 2 divisors, whose sum is σ = 25856490. Its totient is φ = 25856488.

The previous prime is 25856483. The next prime is 25856491. The reversal of 25856489 is 98465852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25836889 + 19600 = 5083^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 25856489 - 2¹⁶ = 25790953 is a prime.

Together with 25856491, 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 (25856483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12928244 + 12928245.

It is an arithmetic number, because the mean of its divisors is an integer number (12928245).

Almost surely, 2^25856489 is an apocalyptic number.

It is an amenable number.

25856489 is a deficient number, since it is larger than the sum of its proper divisors (1).

25856489 is an equidigital number, since it uses as much as digits as its factorization.

25856489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691200, while the sum is 47.

The square root of 25856489 is about 5084.9276297702. The cubic root of 25856489 is about 295.7035358033.

The spelling of 25856489 in words is "twenty-five million, eight hundred fifty-six thousand, four hundred eighty-nine".