331008520 has 16 divisors (see below), whose sum is σ = 744769260. Its totient is φ = 132403392.

The previous prime is 331008497. The next prime is 331008521. The reversal of 331008520 is 25800133.

It can be written as a sum of positive squares in 2 ways, for example, as 288524196 + 42484324 = 16986^2 + 6518^2 .

It is a junction number, because it is equal to n+sod(n) for n = 331008491 and 331008500.

It is not an unprimeable number, because it can be changed into a prime (331008521) 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, 4137567 + ... + 4137646.

Almost surely, 2^331008520 is an apocalyptic number.

It is an amenable number.

331008520 is an abundant number, since it is smaller than the sum of its proper divisors (413760740).

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

331008520 is a wasteful number, since it uses less digits than its factorization.

331008520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8275224 (or 8275220 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 331008520 is about 18193.6395479299. The cubic root of 331008520 is about 691.7455767779.

Adding to 331008520 its reverse (25800133), we get a palindrome (356808653).

The spelling of 331008520 in words is "three hundred thirty-one million, eight thousand, five hundred twenty".