5731 has 4 divisors (see below), whose sum is σ = 6264. Its totient is φ = 5200.

The previous prime is 5717. The next prime is 5737. The reversal of 5731 is 1375.

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-5731 is a prime.

It is a super-2 number, since 2×5731² = 65688722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (5737) 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, 250 + ... + 271.

It is an arithmetic number, because the mean of its divisors is an integer number (1566).

2⁵⁷³¹ is an apocalyptic number.

5731 is a deficient number, since it is larger than the sum of its proper divisors (533).

5731 is a wasteful number, since it uses less digits than its factorization.

5731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532.

The product of its digits is 105, while the sum is 16.

The square root of 5731 is about 75.7033684852. The cubic root of 5731 is about 17.8954848531.

Subtracting from 5731 its reverse (1375), we obtain a square (4356 = 66²).

It can be divided in two parts, 57 and 31, that added together give a palindrome (88).

The spelling of 5731 in words is "five thousand, seven hundred thirty-one".