31215334172 has 48 divisors (see below), whose sum is σ = 61029652992. Its totient is φ = 13847258880.

The previous prime is 31215334169. The next prime is 31215334201. The reversal of 31215334172 is 27143351213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2504468 + ... + 2516900.

It is an arithmetic number, because the mean of its divisors is an integer number (1271451104).

Almost surely, 2^31215334172 is an apocalyptic number.

It is an amenable number.

31215334172 is a deficient number, since it is larger than the sum of its proper divisors (29814318820).

31215334172 is a wasteful number, since it uses less digits than its factorization.

31215334172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13818 (or 13816 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

Adding to 31215334172 its reverse (27143351213), we get a palindrome (58358685385).

The spelling of 31215334172 in words is "thirty-one billion, two hundred fifteen million, three hundred thirty-four thousand, one hundred seventy-two".