9166821 has 8 divisors (see below), whose sum is σ = 12520704. Its totient is φ = 5962080.

The previous prime is 9166819. The next prime is 9166823. The reversal of 9166821 is 1286619.

It is an interprime number because it is at equal distance from previous prime (9166819) and next prime (9166823).

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

It is not a de Polignac number, because 9166821 - 2¹ = 9166819 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

9166821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9166823) 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, 37141 + ... + 37386.

It is an arithmetic number, because the mean of its divisors is an integer number (1565088).

Almost surely, 2^9166821 is an apocalyptic number.

It is an amenable number.

9166821 is a deficient number, since it is larger than the sum of its proper divisors (3353883).

9166821 is a wasteful number, since it uses less digits than its factorization.

9166821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74571.

The product of its digits is 5184, while the sum is 33.

The square root of 9166821 is about 3027.6758413014. The cubic root of 9166821 is about 209.2857137976.

The spelling of 9166821 in words is "nine million, one hundred sixty-six thousand, eight hundred twenty-one".