999801853 has 2 divisors, whose sum is σ = 999801854. Its totient is φ = 999801852.

The previous prime is 999801839. The next prime is 999801857. The reversal of 999801853 is 358108999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 864242404 + 135559449 = 29398^2 + 11643^2 .

It is a cyclic number.

It is not a de Polignac number, because 999801853 - 2⁵ = 999801821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999801853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999801857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499900926 + 499900927.

It is an arithmetic number, because the mean of its divisors is an integer number (499900927).

Almost surely, 2^999801853 is an apocalyptic number.

It is an amenable number.

999801853 is a deficient number, since it is larger than the sum of its proper divisors (1).

999801853 is an equidigital number, since it uses as much as digits as its factorization.

999801853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 52.

The square root of 999801853 is about 31619.6434673132. The cubic root of 999801853 is about 999.9339466370.

The spelling of 999801853 in words is "nine hundred ninety-nine million, eight hundred one thousand, eight hundred fifty-three".