499965209 has 2 divisors, whose sum is σ = 499965210. Its totient is φ = 499965208.

The previous prime is 499965199. The next prime is 499965227. The reversal of 499965209 is 902569994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 446265625 + 53699584 = 21125^2 + 7328^2 .

It is a cyclic number.

It is not a de Polignac number, because 499965209 - 2¹² = 499961113 is a prime.

It is not a weakly prime, because it can be changed into another prime (499935209) 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, 249982604 + 249982605.

It is an arithmetic number, because the mean of its divisors is an integer number (249982605).

Almost surely, 2^499965209 is an apocalyptic number.

It is an amenable number.

499965209 is a deficient number, since it is larger than the sum of its proper divisors (1).

499965209 is an equidigital number, since it uses as much as digits as its factorization.

499965209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The square root of 499965209 is about 22359.9018110545. The cubic root of 499965209 is about 793.6821164671.

The spelling of 499965209 in words is "four hundred ninety-nine million, nine hundred sixty-five thousand, two hundred nine".