312031212 has 24 divisors (see below), whose sum is σ = 747751536. Its totient is φ = 101199168.

The previous prime is 312031211. The next prime is 312031217. The reversal of 312031212 is 212130213.

It is a junction number, because it is equal to n+sod(n) for n = 312031191 and 312031200.

It is not an unprimeable number, because it can be changed into a prime (312031211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350943 + ... + 351830.

It is an arithmetic number, because the mean of its divisors is an integer number (31156314).

Almost surely, 2^312031212 is an apocalyptic number.

It is an amenable number.

312031212 is an abundant number, since it is smaller than the sum of its proper divisors (435720324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

312031212 is a wasteful number, since it uses less digits than its factorization.

312031212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702817 (or 702815 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 312031212 is about 17664.4052263302. The cubic root of 312031212 is about 678.2649046204.

Adding to 312031212 its reverse (212130213), we get a palindrome (524161425).

Subtracting from 312031212 its reverse (212130213), we obtain a palindrome (99900999).

The spelling of 312031212 in words is "three hundred twelve million, thirty-one thousand, two hundred twelve".