25320209 has 2 divisors, whose sum is σ = 25320210. Its totient is φ = 25320208.

The previous prime is 25320199. The next prime is 25320221. The reversal of 25320209 is 90202352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15429184 + 9891025 = 3928^2 + 3145^2 .

It is a cyclic number.

It is not a de Polignac number, because 25320209 - 2⁴ = 25320193 is a prime.

It is a super-2 number, since 2×25320209² = 1282225967607362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25320289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12660104 + 12660105.

It is an arithmetic number, because the mean of its divisors is an integer number (12660105).

Almost surely, 2^25320209 is an apocalyptic number.

It is an amenable number.

25320209 is a deficient number, since it is larger than the sum of its proper divisors (1).

25320209 is an equidigital number, since it uses as much as digits as its factorization.

25320209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 25320209 is about 5031.9190176313. The cubic root of 25320209 is about 293.6448771878.

The spelling of 25320209 in words is "twenty-five million, three hundred twenty thousand, two hundred nine".