25544009 has 2 divisors, whose sum is σ = 25544010. Its totient is φ = 25544008.

The previous prime is 25543993. The next prime is 25544063. The reversal of 25544009 is 90044552.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 2166784 = 4835^2 + 1472^2 .

It is a cyclic number.

It is not a de Polignac number, because 25544009 - 2⁴ = 25543993 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25544089) 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, 12772004 + 12772005.

It is an arithmetic number, because the mean of its divisors is an integer number (12772005).

Almost surely, 2^25544009 is an apocalyptic number.

It is an amenable number.

25544009 is a deficient number, since it is larger than the sum of its proper divisors (1).

25544009 is an equidigital number, since it uses as much as digits as its factorization.

25544009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 25544009 is about 5054.1081310158. The cubic root of 25544009 is about 294.5074957521.

The spelling of 25544009 in words is "twenty-five million, five hundred forty-four thousand, nine".