25585009 has 2 divisors, whose sum is σ = 25585010. Its totient is φ = 25585008.

The previous prime is 25584997. The next prime is 25585033. The reversal of 25585009 is 90058552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15800625 + 9784384 = 3975^2 + 3128^2 .

It is a cyclic number.

It is not a de Polignac number, because 25585009 - 2¹⁷ = 25453937 is a prime.

It is not a weakly prime, because it can be changed into another prime (25585069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12792504 + 12792505.

It is an arithmetic number, because the mean of its divisors is an integer number (12792505).

Almost surely, 2^25585009 is an apocalyptic number.

It is an amenable number.

25585009 is a deficient number, since it is larger than the sum of its proper divisors (1).

25585009 is an equidigital number, since it uses as much as digits as its factorization.

25585009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 25585009 is about 5058.1626110674. The cubic root of 25585009 is about 294.6649802039.

It can be divided in two parts, 255 and 85009, that added together give a square (85264 = 292²).

The spelling of 25585009 in words is "twenty-five million, five hundred eighty-five thousand, nine".