31223012 has 12 divisors (see below), whose sum is σ = 55332480. Its totient is φ = 15413736.

The previous prime is 31222991. The next prime is 31223021. The reversal of 31223012 is 21032213.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49088 + ... + 49719.

It is an arithmetic number, because the mean of its divisors is an integer number (4611040).

Almost surely, 2^31223012 is an apocalyptic number.

It is an amenable number.

31223012 is a deficient number, since it is larger than the sum of its proper divisors (24109468).

31223012 is a wasteful number, since it uses less digits than its factorization.

31223012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98890 (or 98888 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31223012 is about 5587.7555422549. The cubic root of 31223012 is about 314.8895623606.

Adding to 31223012 its reverse (21032213), we get a palindrome (52255225).

The spelling of 31223012 in words is "thirty-one million, two hundred twenty-three thousand, twelve".