31212112 has 10 divisors (see below), whose sum is σ = 60473498. Its totient is φ = 15606048.

The previous prime is 31212061. The next prime is 31212113. The reversal of 31212112 is 21121213.

It can be written as a sum of positive squares in only one way, i.e., 30958096 + 254016 = 5564^2 + 504^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31212092 and 31212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975363 + ... + 975394.

Almost surely, 2^31212112 is an apocalyptic number.

It is an amenable number.

31212112 is a deficient number, since it is larger than the sum of its proper divisors (29261386).

31212112 is a wasteful number, since it uses less digits than its factorization.

31212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950765 (or 1950759 counting only the distinct ones).

The product of its digits is 24, while the sum is 13.

The square root of 31212112 is about 5586.7801102245. The cubic root of 31212112 is about 314.8529152906.

Adding to 31212112 its reverse (21121213), we get a palindrome (52333325).

It can be divided in two parts, 3121211 and 2, that added together give a palindrome (3121213).

The spelling of 31212112 in words is "thirty-one million, two hundred twelve thousand, one hundred twelve".