99861857 has 2 divisors, whose sum is σ = 99861858. Its totient is φ = 99861856.

The previous prime is 99861851. The next prime is 99861901. The reversal of 99861857 is 75816899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87534736 + 12327121 = 9356^2 + 3511^2 .

It is an emirp because it is prime and its reverse (75816899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99861857 - 2⁴ = 99861841 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 99861799 and 99861808.

It is not a weakly prime, because it can be changed into another prime (99861851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49930928 + 49930929.

It is an arithmetic number, because the mean of its divisors is an integer number (49930929).

Almost surely, 2^99861857 is an apocalyptic number.

It is an amenable number.

99861857 is a deficient number, since it is larger than the sum of its proper divisors (1).

99861857 is an equidigital number, since it uses as much as digits as its factorization.

99861857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 53.

The square root of 99861857 is about 9993.0904629149. The cubic root of 99861857 is about 463.9450505306.

The spelling of 99861857 in words is "ninety-nine million, eight hundred sixty-one thousand, eight hundred fifty-seven".