1311221008 has 40 divisors (see below), whose sum is σ = 2686122720. Its totient is φ = 618336000.

The previous prime is 1311220979. The next prime is 1311221039. The reversal of 1311221008 is 8001221131.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

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, 59508 + ... + 78508.

It is an arithmetic number, because the mean of its divisors is an integer number (67153068).

Almost surely, 2^1311221008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311221008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1343061360).

1311221008 is an abundant number, since it is smaller than the sum of its proper divisors (1374901712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311221008 is a wasteful number, since it uses less digits than its factorization.

1311221008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19255 (or 19249 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1311221008 is about 36210.7857964999. The cubic root of 1311221008 is about 1094.5240268523.

Adding to 1311221008 its reverse (8001221131), we get a palindrome (9312442139).

The spelling of 1311221008 in words is "one billion, three hundred eleven million, two hundred twenty-one thousand, eight".