9116821 has 8 divisors (see below), whose sum is σ = 10755584. Its totient is φ = 7562160.

The previous prime is 9116819. The next prime is 9116831. The reversal of 9116821 is 1286119.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 9116821 - 2¹ = 9116819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9116821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9116831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20790 + ... + 21223.

It is an arithmetic number, because the mean of its divisors is an integer number (1344448).

Almost surely, 2^9116821 is an apocalyptic number.

It is an amenable number.

9116821 is a deficient number, since it is larger than the sum of its proper divisors (1638763).

9116821 is a wasteful number, since it uses less digits than its factorization.

9116821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42051.

The product of its digits is 864, while the sum is 28.

The square root of 9116821 is about 3019.4073921881. The cubic root of 9116821 is about 208.9045067900.

The spelling of 9116821 in words is "nine million, one hundred sixteen thousand, eight hundred twenty-one".