31656 has 16 divisors (see below), whose sum is σ = 79200. Its totient is φ = 10544.

The previous prime is 31649. The next prime is 31657. The reversal of 31656 is 65613.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (31657) by changing a digit.

31656 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 in 3 ways as a sum of consecutive naturals, for example, 636 + ... + 683.

It is an arithmetic number, because the mean of its divisors is an integer number (4950).

2³¹⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

31656 is an abundant number, since it is smaller than the sum of its proper divisors (47544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39600).

31656 is a wasteful number, since it uses less digits than its factorization.

31656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328 (or 1324 counting only the distinct ones).

The product of its digits is 540, while the sum is 21.

The square root of 31656 is about 177.9213309303. The cubic root of 31656 is about 31.6338471917.

The spelling of 31656 in words is "thirty-one thousand, six hundred fifty-six".