999829861 has 2 divisors, whose sum is σ = 999829862. Its totient is φ = 999829860.

The previous prime is 999829847. The next prime is 999829867. The reversal of 999829861 is 168928999.

999829861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 984076900 + 15752961 = 31370^2 + 3969^2 .

It is a cyclic number.

It is not a de Polignac number, because 999829861 - 2¹¹ = 999827813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999829861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999829867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499914930 + 499914931.

It is an arithmetic number, because the mean of its divisors is an integer number (499914931).

Almost surely, 2^999829861 is an apocalyptic number.

It is an amenable number.

999829861 is a deficient number, since it is larger than the sum of its proper divisors (1).

999829861 is an equidigital number, since it uses as much as digits as its factorization.

999829861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5038848, while the sum is 61.

The square root of 999829861 is about 31620.0863534558. The cubic root of 999829861 is about 999.9432837833.

The spelling of 999829861 in words is "nine hundred ninety-nine million, eight hundred twenty-nine thousand, eight hundred sixty-one".