99991164 has 144 divisors (see below), whose sum is σ = 297443328. Its totient is φ = 25909632.

The previous prime is 99991109. The next prime is 99991207. The reversal of 99991164 is 46119999.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 787269 + ... + 787395.

Almost surely, 2^99991164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99991164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148721664).

99991164 is an abundant number, since it is smaller than the sum of its proper divisors (197452164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99991164 is a wasteful number, since it uses less digits than its factorization.

99991164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 255 counting only the distinct ones).

The product of its digits is 157464, while the sum is 48.

The square root of 99991164 is about 9999.5581902402. The cubic root of 99991164 is about 464.1452119323.

The spelling of 99991164 in words is "ninety-nine million, nine hundred ninety-one thousand, one hundred sixty-four".