1331311213 has 4 divisors (see below), whose sum is σ = 1374256768. Its totient is φ = 1288365660.

The previous prime is 1331311193. The next prime is 1331311243. The reversal of 1331311213 is 3121131331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3121131331 = 13537 ⋅230563.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331311213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331311243) 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, 21472731 + ... + 21472792.

It is an arithmetic number, because the mean of its divisors is an integer number (343564192).

Almost surely, 2^1331311213 is an apocalyptic number.

It is an amenable number.

1331311213 is a deficient number, since it is larger than the sum of its proper divisors (42945555).

1331311213 is an equidigital number, since it uses as much as digits as its factorization.

1331311213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42945554.

The product of its digits is 162, while the sum is 19.

The square root of 1331311213 is about 36487.1376378033. The cubic root of 1331311213 is about 1100.0857269276.

Adding to 1331311213 its reverse (3121131331), we get a palindrome (4452442544).

The spelling of 1331311213 in words is "one billion, three hundred thirty-one million, three hundred eleven thousand, two hundred thirteen".