999966281 has 2 divisors, whose sum is σ = 999966282. Its totient is φ = 999966280.

The previous prime is 999966277. The next prime is 999966293. The reversal of 999966281 is 182669999.

999966281 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., 703575625 + 296390656 = 26525^2 + 17216^2 .

It is a cyclic number.

It is not a de Polignac number, because 999966281 - 2² = 999966277 is a prime.

It is a super-2 number, since 2×999966281² = 1999865126273941922, which contains 22 as substring.

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 999966281.

It is not a weakly prime, because it can be changed into another prime (999966221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499983140 + 499983141.

It is an arithmetic number, because the mean of its divisors is an integer number (499983141).

Almost surely, 2^999966281 is an apocalyptic number.

It is an amenable number.

999966281 is a deficient number, since it is larger than the sum of its proper divisors (1).

999966281 is an equidigital number, since it uses as much as digits as its factorization.

999966281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3779136, while the sum is 59.

The square root of 999966281 is about 31622.2434529873. The cubic root of 999966281 is about 999.9887602070.

The spelling of 999966281 in words is "nine hundred ninety-nine million, nine hundred sixty-six thousand, two hundred eighty-one".