331221140 has 12 divisors (see below), whose sum is σ = 695564436. Its totient is φ = 132488448.

The previous prime is 331221139. The next prime is 331221169. The reversal of 331221140 is 41122133.

It can be written as a sum of positive squares in 2 ways, for example, as 134884996 + 196336144 = 11614^2 + 14012^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8280509 + ... + 8280548.

It is an arithmetic number, because the mean of its divisors is an integer number (57963703).

Almost surely, 2^331221140 is an apocalyptic number.

It is an amenable number.

331221140 is an abundant number, since it is smaller than the sum of its proper divisors (364343296).

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

331221140 is a wasteful number, since it uses less digits than its factorization.

331221140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16561066 (or 16561064 counting only the distinct ones).

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

The square root of 331221140 is about 18199.4818607564. The cubic root of 331221140 is about 691.8936570189.

Adding to 331221140 its reverse (41122133), we get a palindrome (372343273).

The spelling of 331221140 in words is "three hundred thirty-one million, two hundred twenty-one thousand, one hundred forty".