6331 has 4 divisors (see below), whose sum is σ = 6832. Its totient is φ = 5832.

The previous prime is 6329. The next prime is 6337. The reversal of 6331 is 1336.

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

It is a 6-Lehmer number, since φ(6331) divides (6331-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 6331 - 2¹ = 6329 is a prime.

It is a super-2 number, since 2×6331² = 80163122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 487 = 6331 / (6 + 3 + 3 + 1).

It is a Duffinian number.

6331 is a lucky number.

It is a plaindrome in base 16.

It is a nialpdrome in base 10.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (6337) 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, 231 + ... + 256.

It is an arithmetic number, because the mean of its divisors is an integer number (1708).

2⁶³³¹ is an apocalyptic number.

6331 is a deficient number, since it is larger than the sum of its proper divisors (501).

6331 is a wasteful number, since it uses less digits than its factorization.

6331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500.

The product of its digits is 54, while the sum is 13.

The square root of 6331 is about 79.5675813381. The cubic root of 6331 is about 18.4993912631.

Adding to 6331 its reverse (1336), we get a palindrome (7667).

It can be divided in two parts, 63 and 31, that multiplied together give a triangular number (1953 = T₆₂).

The spelling of 6331 in words is "six thousand, three hundred thirty-one".