9919161 has 24 divisors (see below), whose sum is σ = 16590080. Its totient is φ = 5593536.

The previous prime is 9919097. The next prime is 9919183. The reversal of 9919161 is 1619199.

It is not a de Polignac number, because 9919161 - 2⁶ = 9919097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9919061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3981 + ... + 5973.

Almost surely, 2^9919161 is an apocalyptic number.

It is an amenable number.

9919161 is a deficient number, since it is larger than the sum of its proper divisors (6670919).

9919161 is a wasteful number, since it uses less digits than its factorization.

9919161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085 (or 2082 counting only the distinct ones).

The product of its digits is 4374, while the sum is 36.

The square root of 9919161 is about 3149.4699554052. The cubic root of 9919161 is about 214.8613564410.

The spelling of 9919161 in words is "nine million, nine hundred nineteen thousand, one hundred sixty-one".