331423521 has 32 divisors (see below), whose sum is σ = 524361600. Its totient is φ = 183552000.

The previous prime is 331423507. The next prime is 331423523. The reversal of 331423521 is 125324133.

It is not a de Polignac number, because 331423521 - 2¹¹ = 331421473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331423491 and 331423500.

It is not an unprimeable number, because it can be changed into a prime (331423523) 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 31 ways as a sum of consecutive naturals, for example, 39505 + ... + 47153.

It is an arithmetic number, because the mean of its divisors is an integer number (16386300).

Almost surely, 2^331423521 is an apocalyptic number.

It is an amenable number.

331423521 is a deficient number, since it is larger than the sum of its proper divisors (192938079).

331423521 is a wasteful number, since it uses less digits than its factorization.

331423521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7777.

The product of its digits is 2160, while the sum is 24.

The square root of 331423521 is about 18205.0410875669. The cubic root of 331423521 is about 692.0345474026.

Adding to 331423521 its reverse (125324133), we get a palindrome (456747654).

It can be divided in two parts, 33142 and 3521, that added together give a palindrome (36663).

The spelling of 331423521 in words is "three hundred thirty-one million, four hundred twenty-three thousand, five hundred twenty-one".