1331521424 has 40 divisors (see below), whose sum is σ = 2676757248. Its totient is φ = 640967040.

The previous prime is 1331521423. The next prime is 1331521439. The reversal of 1331521424 is 4241251331.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1331521393 and 1331521402.

It is not an unprimeable number, because it can be changed into a prime (1331521423) 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 7 ways as a sum of consecutive naturals, for example, 90899 + ... + 104525.

Almost surely, 2^1331521424 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 1331521424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1338378624).

1331521424 is an abundant number, since it is smaller than the sum of its proper divisors (1345235824).

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

1331521424 is a wasteful number, since it uses less digits than its factorization.

1331521424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13863 (or 13857 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 1331521424 is about 36490.0181419522. The cubic root of 1331521424 is about 1100.1436242217.

Adding to 1331521424 its reverse (4241251331), we get a palindrome (5572772755).

The spelling of 1331521424 in words is "one billion, three hundred thirty-one million, five hundred twenty-one thousand, four hundred twenty-four".