331018812 has 30 divisors (see below), whose sum is σ = 865349408. Its totient is φ = 110339496.

The previous prime is 331018811. The next prime is 331018841. The reversal of 331018812 is 218810133.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331018811) 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 9 ways as a sum of consecutive naturals, for example, 510508 + ... + 511155.

Almost surely, 2^331018812 is an apocalyptic number.

It is an amenable number.

331018812 is an abundant number, since it is smaller than the sum of its proper divisors (534330596).

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

331018812 is a wasteful number, since it uses less digits than its factorization.

331018812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021679 (or 1021668 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 331018812 is about 18193.9223918318. The cubic root of 331018812 is about 691.7527461520.

Adding to 331018812 its reverse (218810133), we get a palindrome (549828945).

It can be divided in two parts, 3310 and 18812, that added together give a palindrome (22122).

The spelling of 331018812 in words is "three hundred thirty-one million, eighteen thousand, eight hundred twelve".