31216 has 10 divisors (see below), whose sum is σ = 60512. Its totient is φ = 15600.

The previous prime is 31193. The next prime is 31219. The reversal of 31216 is 61213.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 31196 and 31205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31219) by changing a digit.

31216 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, 960 + ... + 991.

2³¹²¹⁶ is an apocalyptic number.

It is an amenable number.

31216 is a deficient number, since it is larger than the sum of its proper divisors (29296).

31216 is a wasteful number, since it uses less digits than its factorization.

31216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959 (or 1953 counting only the distinct ones).

The product of its digits is 36, while the sum is 13.

The square root of 31216 is about 176.6805026029. The cubic root of 31216 is about 31.4865988178.

Adding to 31216 its reverse (61213), we get a palindrome (92429).

The spelling of 31216 in words is "thirty-one thousand, two hundred sixteen".