31329212 has 12 divisors (see below), whose sum is σ = 54981360. Its totient is φ = 15620256.

The previous prime is 31329211. The next prime is 31329217. The reversal of 31329212 is 21292313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31329211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9473 + ... + 12344.

It is an arithmetic number, because the mean of its divisors is an integer number (4581780).

Almost surely, 2^31329212 is an apocalyptic number.

It is an amenable number.

31329212 is a deficient number, since it is larger than the sum of its proper divisors (23652148).

31329212 is a wasteful number, since it uses less digits than its factorization.

31329212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22180 (or 22178 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

The square root of 31329212 is about 5597.2503964000. The cubic root of 31329212 is about 315.2461735676.

The spelling of 31329212 in words is "thirty-one million, three hundred twenty-nine thousand, two hundred twelve".