509769116921 has 2 divisors, whose sum is σ = 509769116922. Its totient is φ = 509769116920.

The previous prime is 509769116917. The next prime is 509769116947. The reversal of 509769116921 is 129611967905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 479606111296 + 30163005625 = 692536^2 + 173675^2 .

It is a cyclic number.

It is not a de Polignac number, because 509769116921 - 2² = 509769116917 is a prime.

It is not a weakly prime, because it can be changed into another prime (509769116951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254884558460 + 254884558461.

It is an arithmetic number, because the mean of its divisors is an integer number (254884558461).

Almost surely, 2^509769116921 is an apocalyptic number.

It is an amenable number.

509769116921 is a deficient number, since it is larger than the sum of its proper divisors (1).

509769116921 is an equidigital number, since it uses as much as digits as its factorization.

509769116921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1837080, while the sum is 56.

The spelling of 509769116921 in words is "five hundred nine billion, seven hundred sixty-nine million, one hundred sixteen thousand, nine hundred twenty-one".