25430809 has 2 divisors, whose sum is σ = 25430810. Its totient is φ = 25430808.

The previous prime is 25430789. The next prime is 25430813. The reversal of 25430809 is 90803452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 10220809 = 3900^2 + 3197^2 .

It is a cyclic number.

It is not a de Polignac number, because 25430809 - 2⁵ = 25430777 is a prime.

It is not a weakly prime, because it can be changed into another prime (25430849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12715404 + 12715405.

It is an arithmetic number, because the mean of its divisors is an integer number (12715405).

Almost surely, 2^25430809 is an apocalyptic number.

It is an amenable number.

25430809 is a deficient number, since it is larger than the sum of its proper divisors (1).

25430809 is an equidigital number, since it uses as much as digits as its factorization.

25430809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 25430809 is about 5042.8968857196. The cubic root of 25430809 is about 294.0718082422.

The spelling of 25430809 in words is "twenty-five million, four hundred thirty thousand, eight hundred nine".