1321533552 has 40 divisors (see below), whose sum is σ = 3440859136. Its totient is φ = 437040576.

The previous prime is 1321533547. The next prime is 1321533571. The reversal of 1321533552 is 2553351231.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 102298 + ... + 114489.

Almost surely, 2^1321533552 is an apocalyptic number.

1321533552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1321533552 is an abundant number, since it is smaller than the sum of its proper divisors (2119325584).

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

1321533552 is a wasteful number, since it uses less digits than its factorization.

1321533552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216925 (or 216919 counting only the distinct ones).

The product of its digits is 13500, while the sum is 30.

The square root of 1321533552 is about 36352.9029377297. The cubic root of 1321533552 is about 1097.3859559824.

Adding to 1321533552 its reverse (2553351231), we get a palindrome (3874884783).

The spelling of 1321533552 in words is "one billion, three hundred twenty-one million, five hundred thirty-three thousand, five hundred fifty-two".