1311221113 has 8 divisors (see below), whose sum is σ = 1354781376. Its totient is φ = 1268358000.

The previous prime is 1311221111. The next prime is 1311221143. The reversal of 1311221113 is 3111221131.

It is a happy number.

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 1311221113 - 2¹ = 1311221111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311221111) 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 7 ways as a sum of consecutive naturals, for example, 170463 + ... + 177988.

It is an arithmetic number, because the mean of its divisors is an integer number (169347672).

Almost surely, 2^1311221113 is an apocalyptic number.

It is an amenable number.

1311221113 is a deficient number, since it is larger than the sum of its proper divisors (43560263).

1311221113 is an equidigital number, since it uses as much as digits as its factorization.

1311221113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348575.

The product of its digits is 36, while the sum is 16.

The square root of 1311221113 is about 36210.7872463441. The cubic root of 1311221113 is about 1094.5240560681.

Adding to 1311221113 its reverse (3111221131), we get a palindrome (4422442244).

It can be divided in two parts, 13112 and 21113, that added together give a square (34225 = 185²).

The spelling of 1311221113 in words is "one billion, three hundred eleven million, two hundred twenty-one thousand, one hundred thirteen".