1331121343205 has 8 divisors (see below), whose sum is σ = 1602085511832. Its totient is φ = 1061737141248.

The previous prime is 1331121343193. The next prime is 1331121343247. The reversal of 1331121343205 is 5023431211331.

It can be written as a sum of positive squares in 4 ways, for example, as 242992801249 + 1088128541956 = 492943^2 + 1043134^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1331121343205 - 2⁸ = 1331121342949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394989812 + ... + 394993181.

It is an arithmetic number, because the mean of its divisors is an integer number (200260688979).

Almost surely, 2^{1331121343205} is an apocalyptic number.

It is an amenable number.

1331121343205 is a deficient number, since it is larger than the sum of its proper divisors (270964168627).

1331121343205 is an equidigital number, since it uses as much as digits as its factorization.

1331121343205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789983335.

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 1331121343205 its reverse (5023431211331), we get a palindrome (6354552554536).

The spelling of 1331121343205 in words is "one trillion, three hundred thirty-one billion, one hundred twenty-one million, three hundred forty-three thousand, two hundred five".