999381641 has 2 divisors, whose sum is σ = 999381642. Its totient is φ = 999381640.

The previous prime is 999381637. The next prime is 999381653. The reversal of 999381641 is 146183999.

999381641 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., 829209616 + 170172025 = 28796^2 + 13045^2 .

It is a cyclic number.

It is not a de Polignac number, because 999381641 - 2² = 999381637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999381641.

It is not a weakly prime, because it can be changed into another prime (999381611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499690820 + 499690821.

It is an arithmetic number, because the mean of its divisors is an integer number (499690821).

Almost surely, 2^999381641 is an apocalyptic number.

It is an amenable number.

999381641 is a deficient number, since it is larger than the sum of its proper divisors (1).

999381641 is an equidigital number, since it uses as much as digits as its factorization.

999381641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 50.

The square root of 999381641 is about 31612.9979755163. The cubic root of 999381641 is about 999.7938378334.

The spelling of 999381641 in words is "nine hundred ninety-nine million, three hundred eighty-one thousand, six hundred forty-one".