1321533001 has 4 divisors (see below), whose sum is σ = 1330402500. Its totient is φ = 1312663504.

The previous prime is 1321532977. The next prime is 1321533013. The reversal of 1321533001 is 1003351231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 212576400 + 1108956601 = 14580^2 + 33301^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321533001 - 2⁹ = 1321532489 is a prime.

It is a Duffinian number.

It is a zygodrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 1321533001.

It is not an unprimeable number, because it can be changed into a prime (1321533091) 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 3 ways as a sum of consecutive naturals, for example, 4434526 + ... + 4434823.

It is an arithmetic number, because the mean of its divisors is an integer number (332600625).

Almost surely, 2^1321533001 is an apocalyptic number.

It is an amenable number.

1321533001 is a deficient number, since it is larger than the sum of its proper divisors (8869499).

1321533001 is an equidigital number, since it uses as much as digits as its factorization.

1321533001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8869498.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 1321533001 is about 36352.8953592420. The cubic root of 1321533001 is about 1097.3858034677.

Adding to 1321533001 its reverse (1003351231), we get a palindrome (2324884232).

The spelling of 1321533001 in words is "one billion, three hundred twenty-one million, five hundred thirty-three thousand, one".