6681549 has 16 divisors (see below), whose sum is σ = 10220672. Its totient is φ = 3803328.

The previous prime is 6681547. The next prime is 6681557. The reversal of 6681549 is 9451866.

It is not a de Polignac number, because 6681549 - 2¹ = 6681547 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7407 + ... + 8259.

It is an arithmetic number, because the mean of its divisors is an integer number (638792).

Almost surely, 2^6681549 is an apocalyptic number.

It is an amenable number.

6681549 is a deficient number, since it is larger than the sum of its proper divisors (3539123).

6681549 is a wasteful number, since it uses less digits than its factorization.

6681549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its digits is 51840, while the sum is 39.

The square root of 6681549 is about 2584.8692423409. The cubic root of 6681549 is about 188.3471498117.

The spelling of 6681549 in words is "six million, six hundred eighty-one thousand, five hundred forty-nine".