4245209 has 2 divisors, whose sum is σ = 4245210. Its totient is φ = 4245208.

The previous prime is 4245203. The next prime is 4245217. The reversal of 4245209 is 9025424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3610000 + 635209 = 1900^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 4245209 - 2⁴ = 4245193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4245203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2122604 + 2122605.

It is an arithmetic number, because the mean of its divisors is an integer number (2122605).

Almost surely, 2^4245209 is an apocalyptic number.

It is an amenable number.

4245209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4245209 is an equidigital number, since it uses as much as digits as its factorization.

4245209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 4245209 is about 2060.3904969690. The cubic root of 4245209 is about 161.9197005892.

The spelling of 4245209 in words is "four million, two hundred forty-five thousand, two hundred nine".