509363909 has 2 divisors, whose sum is σ = 509363910. Its totient is φ = 509363908.

The previous prime is 509363903. The next prime is 509363927. The reversal of 509363909 is 909363905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 430687009 + 78676900 = 20753^2 + 8870^2 .

It is a cyclic number.

It is not a de Polignac number, because 509363909 - 2⁴ = 509363893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 509363909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509363903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254681954 + 254681955.

It is an arithmetic number, because the mean of its divisors is an integer number (254681955).

Almost surely, 2^509363909 is an apocalyptic number.

It is an amenable number.

509363909 is a deficient number, since it is larger than the sum of its proper divisors (1).

509363909 is an equidigital number, since it uses as much as digits as its factorization.

509363909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196830, while the sum is 44.

The square root of 509363909 is about 22569.0918957764. The cubic root of 509363909 is about 798.6246728866.

It can be divided in two parts, 50936 and 3909, that added together give a palindrome (54845).

The spelling of 509363909 in words is "five hundred nine million, three hundred sixty-three thousand, nine hundred nine".