8116921 has 2 divisors, whose sum is σ = 8116922. Its totient is φ = 8116920.

The previous prime is 8116909. The next prime is 8116961. The reversal of 8116921 is 1296118.

It is a happy number.

8116921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6817321 + 1299600 = 2611^2 + 1140^2 .

It is a cyclic number.

It is not a de Polignac number, because 8116921 - 2⁷ = 8116793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8116921.

It is not a weakly prime, because it can be changed into another prime (8116961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4058460 + 4058461.

It is an arithmetic number, because the mean of its divisors is an integer number (4058461).

Almost surely, 2^8116921 is an apocalyptic number.

It is an amenable number.

8116921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8116921 is an equidigital number, since it uses as much as digits as its factorization.

8116921 is an evil number, because the sum of its binary digits is even.

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

The square root of 8116921 is about 2849.0210599432. The cubic root of 8116921 is about 200.9696331277.

The spelling of 8116921 in words is "eight million, one hundred sixteen thousand, nine hundred twenty-one".