99991163 has 4 divisors (see below), whose sum is σ = 100011168. Its totient is φ = 99971160.

The previous prime is 99991109. The next prime is 99991207. The reversal of 99991163 is 36119999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99991163 - 2¹⁰ = 99990139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99991103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4670 + ... + 14892.

It is an arithmetic number, because the mean of its divisors is an integer number (25002792).

Almost surely, 2^99991163 is an apocalyptic number.

99991163 is a deficient number, since it is larger than the sum of its proper divisors (20005).

99991163 is a wasteful number, since it uses less digits than its factorization.

99991163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20004.

The product of its digits is 118098, while the sum is 47.

The square root of 99991163 is about 9999.5581402380. The cubic root of 99991163 is about 464.1452103850.

The spelling of 99991163 in words is "ninety-nine million, nine hundred ninety-one thousand, one hundred sixty-three".