31218855216 has 40 divisors (see below), whose sum is σ = 85392753264. Its totient is φ = 9794150400.

The previous prime is 31218855211. The next prime is 31218855229. The reversal of 31218855216 is 61255881213.

It is not an unprimeable number, because it can be changed into a prime (31218855211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19128385 + ... + 19130016.

Almost surely, 2^31218855216 is an apocalyptic number.

It is an amenable number.

31218855216 is an abundant number, since it is smaller than the sum of its proper divisors (54173898048).

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

31218855216 is a wasteful number, since it uses less digits than its factorization.

31218855216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38258429 (or 38258423 counting only the distinct ones).

The product of its digits is 115200, while the sum is 42.

The spelling of 31218855216 in words is "thirty-one billion, two hundred eighteen million, eight hundred fifty-five thousand, two hundred sixteen".