6687169 has 4 divisors (see below), whose sum is σ = 6813396. Its totient is φ = 6560944.

The previous prime is 6687167. The next prime is 6687173. The reversal of 6687169 is 9617866.

6687169 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9617866 = 2 ⋅4808933.

It can be written as a sum of positive squares in 2 ways, for example, as 3027600 + 3659569 = 1740^2 + 1913^2 .

It is a cyclic number.

It is not a de Polignac number, because 6687169 - 2¹ = 6687167 is a prime.

It is a super-2 number, since 2×6687169² = 89436458469122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6687167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63034 + ... + 63139.

It is an arithmetic number, because the mean of its divisors is an integer number (1703349).

Almost surely, 2^6687169 is an apocalyptic number.

It is an amenable number.

6687169 is a deficient number, since it is larger than the sum of its proper divisors (126227).

6687169 is a wasteful number, since it uses less digits than its factorization.

6687169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126226.

The product of its digits is 108864, while the sum is 43.

The square root of 6687169 is about 2585.9561094497. The cubic root of 6687169 is about 188.3999426766.

The spelling of 6687169 in words is "six million, six hundred eighty-seven thousand, one hundred sixty-nine".