516814681 has 2 divisors, whose sum is σ = 516814682. Its totient is φ = 516814680.

The previous prime is 516814673. The next prime is 516814691. The reversal of 516814681 is 186418615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357550281 + 159264400 = 18909^2 + 12620^2 .

It is a cyclic number.

It is not a de Polignac number, because 516814681 - 2³ = 516814673 is a prime.

It is a super-2 number, since 2×516814681² = 534194828994263522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (516814621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258407340 + 258407341.

It is an arithmetic number, because the mean of its divisors is an integer number (258407341).

Almost surely, 2^516814681 is an apocalyptic number.

It is an amenable number.

516814681 is a deficient number, since it is larger than the sum of its proper divisors (1).

516814681 is an equidigital number, since it uses as much as digits as its factorization.

516814681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 40.

The square root of 516814681 is about 22733.5584764022. The cubic root of 516814681 is about 802.4998268003.

The spelling of 516814681 in words is "five hundred sixteen million, eight hundred fourteen thousand, six hundred eighty-one".