331813540 has 12 divisors (see below), whose sum is σ = 696808476. Its totient is φ = 132725408.

The previous prime is 331813487. The next prime is 331813541. The reversal of 331813540 is 45318133.

It can be written as a sum of positive squares in 2 ways, for example, as 205520896 + 126292644 = 14336^2 + 11238^2 .

It is a super-2 number, since 2×331813540² = 220200450654663200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331813499 and 331813508.

It is not an unprimeable number, because it can be changed into a prime (331813541) 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 3 ways as a sum of consecutive naturals, for example, 8295319 + ... + 8295358.

It is an arithmetic number, because the mean of its divisors is an integer number (58067373).

Almost surely, 2^331813540 is an apocalyptic number.

It is an amenable number.

331813540 is an abundant number, since it is smaller than the sum of its proper divisors (364994936).

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

331813540 is a wasteful number, since it uses less digits than its factorization.

331813540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16590686 (or 16590684 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 331813540 is about 18215.7497786943. The cubic root of 331813540 is about 692.3059029330.

The spelling of 331813540 in words is "three hundred thirty-one million, eight hundred thirteen thousand, five hundred forty".