516809947 has 2 divisors, whose sum is σ = 516809948. Its totient is φ = 516809946.

The previous prime is 516809939. The next prime is 516809963. The reversal of 516809947 is 749908615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 516809947 - 2³ = 516809939 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 516809947.

It is not a weakly prime, because it can be changed into another prime (516809987) 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, 258404973 + 258404974.

It is an arithmetic number, because the mean of its divisors is an integer number (258404974).

Almost surely, 2^516809947 is an apocalyptic number.

516809947 is a deficient number, since it is larger than the sum of its proper divisors (1).

516809947 is an equidigital number, since it uses as much as digits as its factorization.

516809947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 516809947 is about 22733.4543569604. The cubic root of 516809947 is about 802.4973765050.

The spelling of 516809947 in words is "five hundred sixteen million, eight hundred nine thousand, nine hundred forty-seven".