999065681 has 2 divisors, whose sum is σ = 999065682. Its totient is φ = 999065680.

The previous prime is 999065671. The next prime is 999065713. The reversal of 999065681 is 186560999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 937584400 + 61481281 = 30620^2 + 7841^2 .

It is a cyclic number.

It is not a de Polignac number, because 999065681 - 2¹⁸ = 998803537 is a prime.

It is a super-2 number, since 2×999065681² = 1996264469903987522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999065611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499532840 + 499532841.

It is an arithmetic number, because the mean of its divisors is an integer number (499532841).

Almost surely, 2^999065681 is an apocalyptic number.

It is an amenable number.

999065681 is a deficient number, since it is larger than the sum of its proper divisors (1).

999065681 is an equidigital number, since it uses as much as digits as its factorization.

999065681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The square root of 999065681 is about 31608.0002689193. Note that the first 3 decimals coincide. The cubic root of 999065681 is about 999.6884632883.

The spelling of 999065681 in words is "nine hundred ninety-nine million, sixty-five thousand, six hundred eighty-one".