1001331321 has 8 divisors (see below), whose sum is σ = 1337457120. Its totient is φ = 666379872.

The previous prime is 1001331313. The next prime is 1001331323. The reversal of 1001331321 is 1231331001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1001331321 - 2³ = 1001331313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001331321.

It is not an unprimeable number, because it can be changed into a prime (1001331323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291595 + ... + 295008.

It is an arithmetic number, because the mean of its divisors is an integer number (167182140).

Almost surely, 2^1001331321 is an apocalyptic number.

It is an amenable number.

1001331321 is a deficient number, since it is larger than the sum of its proper divisors (336125799).

1001331321 is an equidigital number, since it uses as much as digits as its factorization.

1001331321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587175.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 1001331321 is about 31643.8196335398. The cubic root of 1001331321 is about 1000.4435768771.

Adding to 1001331321 its reverse (1231331001), we get a palindrome (2232662322).

The spelling of 1001331321 in words is "one billion, one million, three hundred thirty-one thousand, three hundred twenty-one".