516686813 has 2 divisors, whose sum is σ = 516686814. Its totient is φ = 516686812.

The previous prime is 516686803. The next prime is 516686857. The reversal of 516686813 is 318686615.

It is an a-pointer prime, because the next prime (516686857) can be obtained adding 516686813 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 510669604 + 6017209 = 22598^2 + 2453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-516686813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (516686803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258343406 + 258343407.

It is an arithmetic number, because the mean of its divisors is an integer number (258343407).

Almost surely, 2^516686813 is an apocalyptic number.

It is an amenable number.

516686813 is a deficient number, since it is larger than the sum of its proper divisors (1).

516686813 is an equidigital number, since it uses as much as digits as its factorization.

516686813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 516686813 is about 22730.7459842391. The cubic root of 516686813 is about 802.4336376900.

The spelling of 516686813 in words is "five hundred sixteen million, six hundred eighty-six thousand, eight hundred thirteen".