999951857 has 2 divisors, whose sum is σ = 999951858. Its totient is φ = 999951856.

The previous prime is 999951851. The next prime is 999951863. The reversal of 999951857 is 758159999.

It is a balanced prime because it is at equal distance from previous prime (999951851) and next prime (999951863).

It can be written as a sum of positive squares in only one way, i.e., 939361201 + 60590656 = 30649^2 + 7784^2 .

It is a cyclic number.

It is not a de Polignac number, because 999951857 - 2⁶ = 999951793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999951857.

It is not a weakly prime, because it can be changed into another prime (999951851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499975928 + 499975929.

It is an arithmetic number, because the mean of its divisors is an integer number (499975929).

Almost surely, 2^999951857 is an apocalyptic number.

It is an amenable number.

999951857 is a deficient number, since it is larger than the sum of its proper divisors (1).

999951857 is an equidigital number, since it uses as much as digits as its factorization.

999951857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9185400, while the sum is 62.

The square root of 999951857 is about 31622.0153848549. The cubic root of 999951857 is about 999.9839520758.

The spelling of 999951857 in words is "nine hundred ninety-nine million, nine hundred fifty-one thousand, eight hundred fifty-seven".