99855851 has 2 divisors, whose sum is σ = 99855852. Its totient is φ = 99855850.

The previous prime is 99855839. The next prime is 99855853. The reversal of 99855851 is 15855899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99855851 - 2¹⁰ = 99854827 is a prime.

Together with 99855853, it forms a pair of twin primes.

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 99855851.

It is not a weakly prime, because it can be changed into another prime (99855853) 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, 49927925 + 49927926.

It is an arithmetic number, because the mean of its divisors is an integer number (49927926).

Almost surely, 2^99855851 is an apocalyptic number.

99855851 is a deficient number, since it is larger than the sum of its proper divisors (1).

99855851 is an equidigital number, since it uses as much as digits as its factorization.

99855851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 50.

The square root of 99855851 is about 9992.7899507595. The cubic root of 99855851 is about 463.9357493155.

The spelling of 99855851 in words is "ninety-nine million, eight hundred fifty-five thousand, eight hundred fifty-one".