999999000857 has 2 divisors, whose sum is σ = 999999000858. Its totient is φ = 999999000856.

The previous prime is 999999000841. The next prime is 999999000899. The reversal of 999999000857 is 758000999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 768925549456 + 231073451401 = 876884^2 + 480701^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999000857 - 2⁴ = 999999000841 is a prime.

It is not a weakly prime, because it can be changed into another prime (999999000817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999500428 + 499999500429.

It is an arithmetic number, because the mean of its divisors is an integer number (499999500429).

Almost surely, 2^999999000857 is an apocalyptic number.

It is an amenable number.

999999000857 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999000857 is an equidigital number, since it uses as much as digits as its factorization.

999999000857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 148803480, while the sum is 74.

The spelling of 999999000857 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, eight hundred fifty-seven", and thus it is an aban number.