99863891 has 2 divisors, whose sum is σ = 99863892. Its totient is φ = 99863890.

The previous prime is 99863887. The next prime is 99863909. The reversal of 99863891 is 19836899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99863891 - 2² = 99863887 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (99863591) 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, 49931945 + 49931946.

It is an arithmetic number, because the mean of its divisors is an integer number (49931946).

Almost surely, 2^99863891 is an apocalyptic number.

99863891 is a deficient number, since it is larger than the sum of its proper divisors (1).

99863891 is an equidigital number, since it uses as much as digits as its factorization.

99863891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 53.

The square root of 99863891 is about 9993.1922327152. The cubic root of 99863891 is about 463.9482004080.

The spelling of 99863891 in words is "ninety-nine million, eight hundred sixty-three thousand, eight hundred ninety-one".