31512012 has 48 divisors (see below), whose sum is σ = 86311680. Its totient is φ = 8759232.

The previous prime is 31512011. The next prime is 31512017. The reversal of 31512012 is 21021513.

It is a junction number, because it is equal to n+sod(n) for n = 31511982 and 31512000.

It is not an unprimeable number, because it can be changed into a prime (31512011) 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 15 ways as a sum of consecutive naturals, for example, 1962 + ... + 8177.

It is an arithmetic number, because the mean of its divisors is an integer number (1798160).

Almost surely, 2^31512012 is an apocalyptic number.

It is an amenable number.

31512012 is an abundant number, since it is smaller than the sum of its proper divisors (54799668).

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

31512012 is a wasteful number, since it uses less digits than its factorization.

31512012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10190 (or 10188 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 31512012 is about 5613.5560921754. The cubic root of 31512012 is about 315.8581187555.

Adding to 31512012 its reverse (21021513), we get a palindrome (52533525).

The spelling of 31512012 in words is "thirty-one million, five hundred twelve thousand, twelve".