9991169 has 8 divisors (see below), whose sum is σ = 10546080. Its totient is φ = 9439200.

The previous prime is 9991159. The next prime is 9991183. The reversal of 9991169 is 9611999.

It is a happy number.

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

It is not a de Polignac number, because 9991169 - 2⁸ = 9990913 is a prime.

It is a super-2 number, since 2×9991169² = 199646915973122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9991139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12749 + ... + 13509.

It is an arithmetic number, because the mean of its divisors is an integer number (1318260).

Almost surely, 2^9991169 is an apocalyptic number.

It is an amenable number.

9991169 is a deficient number, since it is larger than the sum of its proper divisors (554911).

9991169 is a wasteful number, since it uses less digits than its factorization.

9991169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471.

The product of its digits is 39366, while the sum is 44.

The square root of 9991169 is about 3160.8810480624. The cubic root of 9991169 is about 215.3800309496.

The spelling of 9991169 in words is "nine million, nine hundred ninety-one thousand, one hundred sixty-nine".