31143 has 8 divisors (see below), whose sum is σ = 47488. Its totient is φ = 17784.

The previous prime is 31139. The next prime is 31147. The reversal of 31143 is 34113.

31143 is nontrivially palindromic in base 8.

It is an interprime number because it is at equal distance from previous prime (31139) and next prime (31147).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31143 - 2² = 31139 is a prime.

31143 is a lucky number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721 + ... + 762.

It is an arithmetic number, because the mean of its divisors is an integer number (5936).

2³¹¹⁴³ is an apocalyptic number.

31143 is a deficient number, since it is larger than the sum of its proper divisors (16345).

31143 is a wasteful number, since it uses less digits than its factorization.

31143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493.

The product of its digits is 36, while the sum is 12.

The square root of 31143 is about 176.4737940885. The cubic root of 31143 is about 31.4620353912.

Adding to 31143 its reverse (34113), we get a palindrome (65256).

The spelling of 31143 in words is "thirty-one thousand, one hundred forty-three".