516551281 has 2 divisors, whose sum is σ = 516551282. Its totient is φ = 516551280.

The previous prime is 516551279. The next prime is 516551297. The reversal of 516551281 is 182155615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 272910400 + 243640881 = 16520^2 + 15609^2 .

It is a cyclic number.

It is not a de Polignac number, because 516551281 - 2¹ = 516551279 is a prime.

It is a super-2 number, since 2×516551281² = 533650451805481922, which contains 22 as substring.

Together with 516551279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (516557281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258275640 + 258275641.

It is an arithmetic number, because the mean of its divisors is an integer number (258275641).

Almost surely, 2^516551281 is an apocalyptic number.

It is an amenable number.

516551281 is a deficient number, since it is larger than the sum of its proper divisors (1).

516551281 is an equidigital number, since it uses as much as digits as its factorization.

516551281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12000, while the sum is 34.

The square root of 516551281 is about 22727.7645403150. The cubic root of 516551281 is about 802.3634694929.

The spelling of 516551281 in words is "five hundred sixteen million, five hundred fifty-one thousand, two hundred eighty-one".