245202405209 has 2 divisors, whose sum is σ = 245202405210. Its totient is φ = 245202405208.

The previous prime is 245202405187. The next prime is 245202405223. The reversal of 245202405209 is 902504202542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178933230025 + 66269175184 = 423005^2 + 257428^2 .

It is a cyclic number.

It is not a de Polignac number, because 245202405209 - 2¹⁶ = 245202339673 is a prime.

It is not a weakly prime, because it can be changed into another prime (245202405509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122601202604 + 122601202605.

It is an arithmetic number, because the mean of its divisors is an integer number (122601202605).

Almost surely, 2^245202405209 is an apocalyptic number.

It is an amenable number.

245202405209 is a deficient number, since it is larger than the sum of its proper divisors (1).

245202405209 is an equidigital number, since it uses as much as digits as its factorization.

245202405209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 245202405209 in words is "two hundred forty-five billion, two hundred two million, four hundred five thousand, two hundred nine".