99891211 has 8 divisors (see below), whose sum is σ = 116946144. Its totient is φ = 83532480.

The previous prime is 99891191. The next prime is 99891251. The reversal of 99891211 is 11219899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99891211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99891251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173740 + ... + 174313.

It is an arithmetic number, because the mean of its divisors is an integer number (14618268).

Almost surely, 2^99891211 is an apocalyptic number.

99891211 is a deficient number, since it is larger than the sum of its proper divisors (17054933).

99891211 is a wasteful number, since it uses less digits than its factorization.

99891211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348101.

The product of its digits is 11664, while the sum is 40.

The square root of 99891211 is about 9994.5590698139. The cubic root of 99891211 is about 463.9905043514.

The spelling of 99891211 in words is "ninety-nine million, eight hundred ninety-one thousand, two hundred eleven".