9111921 has 16 divisors (see below), whose sum is σ = 14953344. Its totient is φ = 4806144.

The previous prime is 9111911. The next prime is 9111929. The reversal of 9111921 is 1291119.

It is not a de Polignac number, because 9111921 - 2⁶ = 9111857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9111891 and 9111900.

It is not an unprimeable number, because it can be changed into a prime (9111929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16416 + ... + 16961.

It is an arithmetic number, because the mean of its divisors is an integer number (934584).

Almost surely, 2^9111921 is an apocalyptic number.

9111921 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

9111921 is a deficient number, since it is larger than the sum of its proper divisors (5841423).

9111921 is a wasteful number, since it uses less digits than its factorization.

9111921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33400.

The product of its digits is 162, while the sum is 24.

The square root of 9111921 is about 3018.5958656302. The cubic root of 9111921 is about 208.8670735836.

The spelling of 9111921 in words is "nine million, one hundred eleven thousand, nine hundred twenty-one".