245045209 has 2 divisors, whose sum is σ = 245045210. Its totient is φ = 245045208.

The previous prime is 245045167. The next prime is 245045219. The reversal of 245045209 is 902540542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238795209 + 6250000 = 15453^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 245045209 - 2¹³ = 245037017 is a prime.

It is not a weakly prime, because it can be changed into another prime (245045219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122522604 + 122522605.

It is an arithmetic number, because the mean of its divisors is an integer number (122522605).

Almost surely, 2^245045209 is an apocalyptic number.

It is an amenable number.

245045209 is a deficient number, since it is larger than the sum of its proper divisors (1).

245045209 is an equidigital number, since it uses as much as digits as its factorization.

245045209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 245045209 is about 15653.9199244151. The cubic root of 245045209 is about 625.7709602814.

The spelling of 245045209 in words is "two hundred forty-five million, forty-five thousand, two hundred nine".