1321001331 has 16 divisors (see below), whose sum is σ = 1904217504. Its totient is φ = 809754624.

The previous prime is 1321001293. The next prime is 1321001333. The reversal of 1321001331 is 1331001231.

It is not a de Polignac number, because 1321001331 - 2¹⁴ = 1320984947 is a prime.

It is a super-2 number, since 2×1321001331² = 3490089033007543122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321001331.

It is not an unprimeable number, because it can be changed into a prime (1321001333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55876 + ... + 75921.

It is an arithmetic number, because the mean of its divisors is an integer number (119013594).

Almost surely, 2^1321001331 is an apocalyptic number.

1321001331 is a deficient number, since it is larger than the sum of its proper divisors (583216173).

1321001331 is a wasteful number, since it uses less digits than its factorization.

1321001331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132070.

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

The square root of 1321001331 is about 36345.5820011181. The cubic root of 1321001331 is about 1097.2386195104.

Adding to 1321001331 its reverse (1331001231), we get a palindrome (2652002562).

The spelling of 1321001331 in words is "one billion, three hundred twenty-one million, one thousand, three hundred thirty-one".