331243540 has 12 divisors (see below), whose sum is σ = 695611476. Its totient is φ = 132497408.

The previous prime is 331243537. The next prime is 331243553. The reversal of 331243540 is 45342133.

It can be written as a sum of positive squares in 2 ways, for example, as 168272784 + 162970756 = 12972^2 + 12766^2 .

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, 8281069 + ... + 8281108.

It is an arithmetic number, because the mean of its divisors is an integer number (57967623).

Almost surely, 2^331243540 is an apocalyptic number.

It is an amenable number.

331243540 is an abundant number, since it is smaller than the sum of its proper divisors (364367936).

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

331243540 is a wasteful number, since it uses less digits than its factorization.

331243540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16562186 (or 16562184 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 331243540 is about 18200.0972524874. The cubic root of 331243540 is about 691.9092539184.

Adding to 331243540 its reverse (45342133), we get a palindrome (376585673).

The spelling of 331243540 in words is "three hundred thirty-one million, two hundred forty-three thousand, five hundred forty".