31318 has 8 divisors (see below), whose sum is σ = 53712. Its totient is φ = 13416.

The previous prime is 31307. The next prime is 31319. The reversal of 31318 is 81313.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31319) 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, 1105 + ... + 1132.

It is an arithmetic number, because the mean of its divisors is an integer number (6714).

2³¹³¹⁸ is an apocalyptic number.

31318 is a deficient number, since it is larger than the sum of its proper divisors (22394).

31318 is a wasteful number, since it uses less digits than its factorization.

31318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246.

The product of its digits is 72, while the sum is 16.

The square root of 31318 is about 176.9689238256. The cubic root of 31318 is about 31.5208562644.

The spelling of 31318 in words is "thirty-one thousand, three hundred eighteen".