331081520 has 160 divisors (see below), whose sum is σ = 974509056. Its totient is φ = 101606400.

The previous prime is 331081493. The next prime is 331081523. The reversal of 331081520 is 25180133.

It is a super-2 number, since 2×331081520² = 219229945771020800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (331081523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 436982 + ... + 437738.

Almost surely, 2^331081520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 331081520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (487254528).

331081520 is an abundant number, since it is smaller than the sum of its proper divisors (643427536).

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

331081520 is a wasteful number, since it uses less digits than its factorization.

331081520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859 (or 853 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 331081520 is about 18195.6456329530. The cubic root of 331081520 is about 691.7964251321.

The spelling of 331081520 in words is "three hundred thirty-one million, eighty-one thousand, five hundred twenty".