1331320330331 has 4 divisors (see below), whose sum is σ = 1331327481000. Its totient is φ = 1331313179664.

The previous prime is 1331320330271. The next prime is 1331320330337. The reversal of 1331320330331 is 1330330231331.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1331320330331 - 2³⁰ = 1330246588507 is a prime.

It is a super-2 number, since 2×1331320330331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331320330331.

It is not an unprimeable number, because it can be changed into a prime (1331320330337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3288386 + ... + 3670983.

It is an arithmetic number, because the mean of its divisors is an integer number (332831870250).

Almost surely, 2^{1331320330331} is an apocalyptic number.

1331320330331 is a deficient number, since it is larger than the sum of its proper divisors (7150669).

1331320330331 is an equidigital number, since it uses as much as digits as its factorization.

1331320330331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7150668.

The product of its (nonzero) digits is 4374, while the sum is 26.

Adding to 1331320330331 its reverse (1330330231331), we get a palindrome (2661650561662).

The spelling of 1331320330331 in words is "one trillion, three hundred thirty-one billion, three hundred twenty million, three hundred thirty thousand, three hundred thirty-one".