8106209 has 4 divisors (see below), whose sum is σ = 8197380. Its totient is φ = 8015040.

The previous prime is 8106199. The next prime is 8106211. The reversal of 8106209 is 9026018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3717184 + 4389025 = 1928^2 + 2095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8106209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8106289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45452 + ... + 45629.

It is an arithmetic number, because the mean of its divisors is an integer number (2049345).

Almost surely, 2^8106209 is an apocalyptic number.

8106209 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

8106209 is a deficient number, since it is larger than the sum of its proper divisors (91171).

8106209 is an equidigital number, since it uses as much as digits as its factorization.

8106209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91170.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 8106209 is about 2847.1404953040. The cubic root of 8106209 is about 200.8811868468.

The spelling of 8106209 in words is "eight million, one hundred six thousand, two hundred nine".