99211191 has 16 divisors (see below), whose sum is σ = 139729920. Its totient is φ = 62516160.

The previous prime is 99211187. The next prime is 99211199. The reversal of 99211191 is 19111299.

It is not a de Polignac number, because 99211191 - 2² = 99211187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99211199) 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 in 15 ways as a sum of consecutive naturals, for example, 8406 + ... + 16403.

It is an arithmetic number, because the mean of its divisors is an integer number (8733120).

Almost surely, 2^99211191 is an apocalyptic number.

99211191 is a deficient number, since it is larger than the sum of its proper divisors (40518729).

99211191 is a wasteful number, since it uses less digits than its factorization.

99211191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24886.

The product of its digits is 1458, while the sum is 33.

The square root of 99211191 is about 9960.4814642667. The cubic root of 99211191 is about 462.9352178891.

The spelling of 99211191 in words is "ninety-nine million, two hundred eleven thousand, one hundred ninety-one".