818867281 has 2 divisors, whose sum is σ = 818867282. Its totient is φ = 818867280.

The previous prime is 818867279. The next prime is 818867303. The reversal of 818867281 is 182768818.

818867281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 789610000 + 29257281 = 28100^2 + 5409^2 .

It is a cyclic number.

It is not a de Polignac number, because 818867281 - 2¹ = 818867279 is a prime.

It is a super-2 number, since 2×818867281² = 1341087247784665922, which contains 22 as substring.

Together with 818867279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (818867251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409433640 + 409433641.

It is an arithmetic number, because the mean of its divisors is an integer number (409433641).

Almost surely, 2^818867281 is an apocalyptic number.

It is an amenable number.

818867281 is a deficient number, since it is larger than the sum of its proper divisors (1).

818867281 is an equidigital number, since it uses as much as digits as its factorization.

818867281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 344064, while the sum is 49.

The square root of 818867281 is about 28615.8571599734. The cubic root of 818867281 is about 935.5589824782.

The spelling of 818867281 in words is "eight hundred eighteen million, eight hundred sixty-seven thousand, two hundred eighty-one".