99986891 has 2 divisors, whose sum is σ = 99986892. Its totient is φ = 99986890.

The previous prime is 99986881. The next prime is 99986927. The reversal of 99986891 is 19868999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99986891 - 2⁶ = 99986827 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 99986891.

It is not a weakly prime, because it can be changed into another prime (99986801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49993445 + 49993446.

It is an arithmetic number, because the mean of its divisors is an integer number (49993446).

Almost surely, 2^99986891 is an apocalyptic number.

99986891 is a deficient number, since it is larger than the sum of its proper divisors (1).

99986891 is an equidigital number, since it uses as much as digits as its factorization.

99986891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 59.

The square root of 99986891 is about 9999.3445285179. The cubic root of 99986891 is about 464.1386002789.

The spelling of 99986891 in words is "ninety-nine million, nine hundred eighty-six thousand, eight hundred ninety-one".