231031212 has 48 divisors (see below), whose sum is σ = 546521472. Its totient is φ = 75953920.

The previous prime is 231031201. The next prime is 231031223. The reversal of 231031212 is 212130132.

231031212 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231031201) and next prime (231031223).

It is a junction number, because it is equal to n+sod(n) for n = 231031191 and 231031200.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 470287 + ... + 470777.

It is an arithmetic number, because the mean of its divisors is an integer number (11385864).

Almost surely, 2^231031212 is an apocalyptic number.

It is an amenable number.

231031212 is an abundant number, since it is smaller than the sum of its proper divisors (315490260).

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

231031212 is a wasteful number, since it uses less digits than its factorization.

231031212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958 (or 956 counting only the distinct ones).

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

The square root of 231031212 is about 15199.7109183037. The cubic root of 231031212 is about 613.6068776933.

Adding to 231031212 its reverse (212130132), we get a palindrome (443161344).

The spelling of 231031212 in words is "two hundred thirty-one million, thirty-one thousand, two hundred twelve".