31316 has 6 divisors (see below), whose sum is σ = 54810. Its totient is φ = 15656.

The previous prime is 31307. The next prime is 31319. The reversal of 31316 is 61313.

It can be written as a sum of positive squares in only one way, i.e., 21316 + 10000 = 146^2 + 100^2 .

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 31316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31319) by changing a digit.

31316 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3911 + ... + 3918.

It is an arithmetic number, because the mean of its divisors is an integer number (9135).

2³¹³¹⁶ is an apocalyptic number.

It is an amenable number.

31316 is a deficient number, since it is larger than the sum of its proper divisors (23494).

31316 is a wasteful number, since it uses less digits than its factorization.

31316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7833 (or 7831 counting only the distinct ones).

The product of its digits is 54, while the sum is 14.

The square root of 31316 is about 176.9632730258. The cubic root of 31316 is about 31.5201852652.

Adding to 31316 its reverse (61313), we get a palindrome (92629).

The spelling of 31316 in words is "thirty-one thousand, three hundred sixteen".