6686541 has 6 divisors (see below), whose sum is σ = 9658350. Its totient is φ = 4457688.

The previous prime is 6686539. The next prime is 6686569. The reversal of 6686541 is 1456866.

It can be written as a sum of positive squares in only one way, i.e., 6502500 + 184041 = 2550^2 + 429^2 .

It is not a de Polignac number, because 6686541 - 2¹ = 6686539 is a prime.

6686541 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6686496 and 6686505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 371466 + ... + 371483.

It is an arithmetic number, because the mean of its divisors is an integer number (1609725).

Almost surely, 2^6686541 is an apocalyptic number.

It is an amenable number.

6686541 is a deficient number, since it is larger than the sum of its proper divisors (2971809).

6686541 is a wasteful number, since it uses less digits than its factorization.

6686541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742955 (or 742952 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 6686541 is about 2585.8346814907. The cubic root of 6686541 is about 188.3940448711.

It can be divided in two parts, 6686 and 541, that added together give a palindrome (7227).

The spelling of 6686541 in words is "six million, six hundred eighty-six thousand, five hundred forty-one".