25636489 has 2 divisors, whose sum is σ = 25636490. Its totient is φ = 25636488.

The previous prime is 25636487. The next prime is 25636519. The reversal of 25636489 is 98463652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22963264 + 2673225 = 4792^2 + 1635^2 .

It is a cyclic number.

It is not a de Polignac number, because 25636489 - 2¹ = 25636487 is a prime.

Together with 25636487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25636483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12818244 + 12818245.

It is an arithmetic number, because the mean of its divisors is an integer number (12818245).

Almost surely, 2^25636489 is an apocalyptic number.

It is an amenable number.

25636489 is a deficient number, since it is larger than the sum of its proper divisors (1).

25636489 is an equidigital number, since it uses as much as digits as its factorization.

25636489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 43.

The square root of 25636489 is about 5063.2488581937. The cubic root of 25636489 is about 294.8624811490.

The spelling of 25636489 in words is "twenty-five million, six hundred thirty-six thousand, four hundred eighty-nine".