6685109 has 6 divisors (see below), whose sum is σ = 6924450. Its totient is φ = 6453776.

The previous prime is 6685043. The next prime is 6685117. The reversal of 6685109 is 9015866.

It can be written as a sum of positive squares in 3 ways, for example, as 1044484 + 5640625 = 1022^2 + 2375^2 .

It is not a de Polignac number, because 6685109 - 2¹² = 6681013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6685409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3134 + ... + 4815.

It is an arithmetic number, because the mean of its divisors is an integer number (1154075).

Almost surely, 2^6685109 is an apocalyptic number.

It is an amenable number.

6685109 is a deficient number, since it is larger than the sum of its proper divisors (239341).

6685109 is an equidigital number, since it uses as much as digits as its factorization.

6685109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8007 (or 7978 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 6685109 is about 2585.5577734794. The cubic root of 6685109 is about 188.3805949905.

The spelling of 6685109 in words is "six million, six hundred eighty-five thousand, one hundred nine".