8212109 has 2 divisors, whose sum is σ = 8212110. Its totient is φ = 8212108.

The previous prime is 8212093. The next prime is 8212147. The reversal of 8212109 is 9012128.

8212109 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., 6100900 + 2111209 = 2470^2 + 1453^2 .

It is a cyclic number.

It is not a de Polignac number, because 8212109 - 2⁴ = 8212093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8212189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4106054 + 4106055.

It is an arithmetic number, because the mean of its divisors is an integer number (4106055).

Almost surely, 2^8212109 is an apocalyptic number.

It is an amenable number.

8212109 is a deficient number, since it is larger than the sum of its proper divisors (1).

8212109 is an equidigital number, since it uses as much as digits as its factorization.

8212109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 8212109 is about 2865.6777557848. The cubic root of 8212109 is about 201.7521795064.

The spelling of 8212109 in words is "eight million, two hundred twelve thousand, one hundred nine".