1311322011 has 16 divisors (see below), whose sum is σ = 1756800000. Its totient is φ = 870041088.

The previous prime is 1311322009. The next prime is 1311322021. The reversal of 1311322011 is 1102231131.

It is a happy number.

It is not a de Polignac number, because 1311322011 - 2¹ = 1311322009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311322021) 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 15 ways as a sum of consecutive naturals, for example, 654990 + ... + 656988.

It is an arithmetic number, because the mean of its divisors is an integer number (109800000).

Almost surely, 2^1311322011 is an apocalyptic number.

1311322011 is a deficient number, since it is larger than the sum of its proper divisors (445477989).

1311322011 is a wasteful number, since it uses less digits than its factorization.

1311322011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938.

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

The square root of 1311322011 is about 36212.1804231670. The cubic root of 1311322011 is about 1094.5521297607.

Adding to 1311322011 its reverse (1102231131), we get a palindrome (2413553142).

The spelling of 1311322011 in words is "one billion, three hundred eleven million, three hundred twenty-two thousand, eleven".