8102909 has 4 divisors (see below), whose sum is σ = 8108604. Its totient is φ = 8097216.

The previous prime is 8102903. The next prime is 8102921. The reversal of 8102909 is 9092018.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3276100 + 4826809 = 1810^2 + 2197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8102909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8102903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1349 + ... + 4245.

It is an arithmetic number, because the mean of its divisors is an integer number (2027151).

Almost surely, 2^8102909 is an apocalyptic number.

It is an amenable number.

8102909 is a deficient number, since it is larger than the sum of its proper divisors (5695).

8102909 is a wasteful number, since it uses less digits than its factorization.

8102909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5694.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 8102909 is about 2846.5609074812. The cubic root of 8102909 is about 200.8539238811.

The spelling of 8102909 in words is "eight million, one hundred two thousand, nine hundred nine".