31133212 has 12 divisors (see below), whose sum is σ = 59436216. Its totient is φ = 14151440.

The previous prime is 31133209. The next prime is 31133213. The reversal of 31133212 is 21233113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31133213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353743 + ... + 353830.

It is an arithmetic number, because the mean of its divisors is an integer number (4953018).

Almost surely, 2^31133212 is an apocalyptic number.

It is an amenable number.

31133212 is a deficient number, since it is larger than the sum of its proper divisors (28303004).

31133212 is a wasteful number, since it uses less digits than its factorization.

31133212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707588 (or 707586 counting only the distinct ones).

The product of its digits is 108, while the sum is 16.

The square root of 31133212 is about 5579.7143296051. The cubic root of 31133212 is about 314.5873895573.

Adding to 31133212 its reverse (21233113), we get a palindrome (52366325).

Subtracting from 31133212 its reverse (21233113), we obtain a palindrome (9900099).

The spelling of 31133212 in words is "thirty-one million, one hundred thirty-three thousand, two hundred twelve".