245039209 has 2 divisors, whose sum is σ = 245039210. Its totient is φ = 245039208.

The previous prime is 245039189. The next prime is 245039239. The reversal of 245039209 is 902930542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168091225 + 76947984 = 12965^2 + 8772^2 .

It is a cyclic number.

It is not a de Polignac number, because 245039209 - 2²¹ = 242942057 is a prime.

It is not a weakly prime, because it can be changed into another prime (245039239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122519604 + 122519605.

It is an arithmetic number, because the mean of its divisors is an integer number (122519605).

Almost surely, 2^245039209 is an apocalyptic number.

It is an amenable number.

245039209 is a deficient number, since it is larger than the sum of its proper divisors (1).

245039209 is an equidigital number, since it uses as much as digits as its factorization.

245039209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 245039209 is about 15653.7282779535. The cubic root of 245039209 is about 625.7658528478.

The spelling of 245039209 in words is "two hundred forty-five million, thirty-nine thousand, two hundred nine".