25536689 has 2 divisors, whose sum is σ = 25536690. Its totient is φ = 25536688.

The previous prime is 25536673. The next prime is 25536691. The reversal of 25536689 is 98663552.

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., 24601600 + 935089 = 4960^2 + 967^2 .

It is a cyclic number.

It is not a de Polignac number, because 25536689 - 2⁴ = 25536673 is a prime.

Together with 25536691, 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 (25536649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12768344 + 12768345.

It is an arithmetic number, because the mean of its divisors is an integer number (12768345).

Almost surely, 2^25536689 is an apocalyptic number.

It is an amenable number.

25536689 is a deficient number, since it is larger than the sum of its proper divisors (1).

25536689 is an equidigital number, since it uses as much as digits as its factorization.

25536689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 44.

The square root of 25536689 is about 5053.3839157539. The cubic root of 25536689 is about 294.4793612904.

The spelling of 25536689 in words is "twenty-five million, five hundred thirty-six thousand, six hundred eighty-nine".