1311320211 has 8 divisors (see below), whose sum is σ = 1851275664. Its totient is φ = 822789120.

The previous prime is 1311320191. The next prime is 1311320267. The reversal of 1311320211 is 1120231131.

It is a happy number.

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

It is not a de Polignac number, because 1311320211 - 2⁹ = 1311319699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311320281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12856030 + ... + 12856131.

It is an arithmetic number, because the mean of its divisors is an integer number (231409458).

Almost surely, 2^1311320211 is an apocalyptic number.

1311320211 is a deficient number, since it is larger than the sum of its proper divisors (539955453).

1311320211 is a wasteful number, since it uses less digits than its factorization.

1311320211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25712181.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1311320211 is about 36212.1555696426. The cubic root of 1311320211 is about 1094.5516289443.

Adding to 1311320211 its reverse (1120231131), we get a palindrome (2431551342).

The spelling of 1311320211 in words is "one billion, three hundred eleven million, three hundred twenty thousand, two hundred eleven".