331121240 has 32 divisors (see below), whose sum is σ = 788849280. Its totient is φ = 124657152.

The previous prime is 331121239. The next prime is 331121249. The reversal of 331121240 is 42121133.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331121249) 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 7 ways as a sum of consecutive naturals, for example, 242792 + ... + 244151.

It is an arithmetic number, because the mean of its divisors is an integer number (24651540).

Almost surely, 2^331121240 is an apocalyptic number.

It is an amenable number.

331121240 is an abundant number, since it is smaller than the sum of its proper divisors (457728040).

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

331121240 is a wasteful number, since it uses less digits than its factorization.

331121240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486971 (or 486967 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 331121240 is about 18196.7370701453. The cubic root of 331121240 is about 691.8240890694.

Adding to 331121240 its reverse (42121133), we get a palindrome (373242373).

The spelling of 331121240 in words is "three hundred thirty-one million, one hundred twenty-one thousand, two hundred forty".