9991046169 has 20 divisors (see below), whose sum is σ = 16072966756. Its totient is φ = 6148335456.

The previous prime is 9991046167. The next prime is 9991046189. The reversal of 9991046169 is 9616401999.

9991046169 is a `hidden beast` number, since 9 + 9 + 9 + 10 + 4 + 616 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1839123225 + 8151922944 = 42885^2 + 90288^2 .

It is not a de Polignac number, because 9991046169 - 2¹ = 9991046167 is a prime.

It is a super-2 number, since 2×9991046169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9991046161) by changing a digit.

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

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4743034 + ... + 4745139.

Almost surely, 2^9991046169 is an apocalyptic number.

It is an amenable number.

9991046169 is a deficient number, since it is larger than the sum of its proper divisors (6081920587).

9991046169 is a wasteful number, since it uses less digits than its factorization.

9991046169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9488198 (or 9488189 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The square root of 9991046169 is about 99955.2208191248. The cubic root of 9991046169 is about 2153.7914832177.

The spelling of 9991046169 in words is "nine billion, nine hundred ninety-one million, forty-six thousand, one hundred sixty-nine".