31568 has 10 divisors (see below), whose sum is σ = 61194. Its totient is φ = 15776.

The previous prime is 31567. The next prime is 31573. The reversal of 31568 is 86513.

It can be written as a sum of positive squares in only one way, i.e., 23104 + 8464 = 152^2 + 92^2 .

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 971 + ... + 1002.

2³¹⁵⁶⁸ is an apocalyptic number.

It is an amenable number.

31568 is a deficient number, since it is larger than the sum of its proper divisors (29626).

31568 is a wasteful number, since it uses less digits than its factorization.

31568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981 (or 1975 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 31568 is about 177.6738585161. The cubic root of 31568 is about 31.6045071817.

Subtracting 31568 from its reverse (86513), we obtain a palindrome (54945).

It can be divided in two parts, 315 and 68, that added together give a palindrome (383).

The spelling of 31568 in words is "thirty-one thousand, five hundred sixty-eight".