6731 has 4 divisors (see below), whose sum is σ = 6912. Its totient is φ = 6552.

The previous prime is 6719. The next prime is 6733. The reversal of 6731 is 1376.

6731 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6731 is a prime.

It is a super-2 number, since 2×6731² = 90612722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11 + ... + 116.

It is an arithmetic number, because the mean of its divisors is an integer number (1728).

2⁶⁷³¹ is an apocalyptic number.

6731 is a deficient number, since it is larger than the sum of its proper divisors (181).

6731 is a wasteful number, since it uses less digits than its factorization.

6731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180.

The product of its digits is 126, while the sum is 17.

The square root of 6731 is about 82.0426718239. The cubic root of 6731 is about 18.8810668625.

It can be divided in two parts, 6 and 731, that added together give a palindrome (737).

The spelling of 6731 in words is "six thousand, seven hundred thirty-one".