516805109 has 2 divisors, whose sum is σ = 516805110. Its totient is φ = 516805108.

The previous prime is 516805097. The next prime is 516805127. The reversal of 516805109 is 901508615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317374225 + 199430884 = 17815^2 + 14122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-516805109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (516805199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258402554 + 258402555.

It is an arithmetic number, because the mean of its divisors is an integer number (258402555).

Almost surely, 2^516805109 is an apocalyptic number.

It is an amenable number.

516805109 is a deficient number, since it is larger than the sum of its proper divisors (1).

516805109 is an equidigital number, since it uses as much as digits as its factorization.

516805109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 516805109 is about 22733.3479496532. The cubic root of 516805109 is about 802.4948723643.

The spelling of 516805109 in words is "five hundred sixteen million, eight hundred five thousand, one hundred nine".