331481521 has 24 divisors (see below), whose sum is σ = 409743360. Its totient is φ = 266458752.

The previous prime is 331481489. The next prime is 331481531. The reversal of 331481521 is 125184133.

It is a happy number.

It is not a de Polignac number, because 331481521 - 2⁵ = 331481489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331481521.

It is not an unprimeable number, because it can be changed into a prime (331481531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 318520 + ... + 319558.

It is an arithmetic number, because the mean of its divisors is an integer number (17072640).

Almost surely, 2^331481521 is an apocalyptic number.

It is an amenable number.

331481521 is a deficient number, since it is larger than the sum of its proper divisors (78261839).

331481521 is a wasteful number, since it uses less digits than its factorization.

331481521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453 (or 1446 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 331481521 is about 18206.6339832491. The cubic root of 331481521 is about 692.0749143450.

The spelling of 331481521 in words is "three hundred thirty-one million, four hundred eighty-one thousand, five hundred twenty-one".