31912 has 8 divisors (see below), whose sum is σ = 59850. Its totient is φ = 15952.

The previous prime is 31907. The next prime is 31957. The reversal of 31912 is 21913.

It can be written as a sum of positive squares in only one way, i.e., 27556 + 4356 = 166^2 + 66^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 13.

It is an unprimeable number.

31912 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, 1987 + ... + 2002.

2³¹⁹¹² is an apocalyptic number.

It is an amenable number.

31912 is a deficient number, since it is larger than the sum of its proper divisors (27938).

31912 is a wasteful number, since it uses less digits than its factorization.

31912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3995 (or 3991 counting only the distinct ones).

The product of its digits is 54, while the sum is 16.

The square root of 31912 is about 178.6393013869. The cubic root of 31912 is about 31.7188919688.

Subtracting from 31912 its reverse (21913), we obtain a palindrome (9999).

It can be divided in two parts, 319 and 12, that multiplied together give a triangular number (3828 = T₈₇).

The spelling of 31912 in words is "thirty-one thousand, nine hundred twelve".