25864859 has 2 divisors, whose sum is σ = 25864860. Its totient is φ = 25864858.

The previous prime is 25864847. The next prime is 25864921. The reversal of 25864859 is 95846852.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25864859 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25861859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12932429 + 12932430.

It is an arithmetic number, because the mean of its divisors is an integer number (12932430).

Almost surely, 2^25864859 is an apocalyptic number.

25864859 is a deficient number, since it is larger than the sum of its proper divisors (1).

25864859 is an equidigital number, since it uses as much as digits as its factorization.

25864859 is an odious number, because the sum of its binary digits is odd.

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

The square root of 25864859 is about 5085.7505837388. The cubic root of 25864859 is about 295.7354397428.

The spelling of 25864859 in words is "twenty-five million, eight hundred sixty-four thousand, eight hundred fifty-nine".