331320144 has 20 divisors (see below), whose sum is σ = 855910496. Its totient is φ = 110440032.

The previous prime is 331320137. The next prime is 331320149. The reversal of 331320144 is 441023133.

331320144 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 331320144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331320149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3451204 + ... + 3451299.

Almost surely, 2^331320144 is an apocalyptic number.

It is an amenable number.

331320144 is an abundant number, since it is smaller than the sum of its proper divisors (524590352).

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

331320144 is a wasteful number, since it uses less digits than its factorization.

331320144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6902514 (or 6902508 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 331320144 is about 18202.2016250782. The cubic root of 331320144 is about 691.9625872163.

Adding to 331320144 its reverse (441023133), we get a palindrome (772343277).

The spelling of 331320144 in words is "three hundred thirty-one million, three hundred twenty thousand, one hundred forty-four".