331981540 has 48 divisors (see below), whose sum is σ = 793618560. Its totient is φ = 115470080.

The previous prime is 331981513. The next prime is 331981541. The reversal of 331981540 is 45189133.

It is a super-2 number, since 2×331981540² = 220423485801543200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331981496 and 331981505.

It is not an unprimeable number, because it can be changed into a prime (331981541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27745 + ... + 37864.

It is an arithmetic number, because the mean of its divisors is an integer number (16533720).

Almost surely, 2^331981540 is an apocalyptic number.

It is an amenable number.

331981540 is an abundant number, since it is smaller than the sum of its proper divisors (461637020).

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

331981540 is a wasteful number, since it uses less digits than its factorization.

331981540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65652 (or 65650 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 331981540 is about 18220.3605891870. The cubic root of 331981540 is about 692.4227233297.

The spelling of 331981540 in words is "three hundred thirty-one million, nine hundred eighty-one thousand, five hundred forty".