1311322220 has 24 divisors (see below), whose sum is σ = 2965606224. Its totient is φ = 484180416.

The previous prime is 1311322213. The next prime is 1311322273. The reversal of 1311322220 is 222231131.

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, 2521514 + ... + 2522033.

It is an arithmetic number, because the mean of its divisors is an integer number (123566926).

Almost surely, 2^1311322220 is an apocalyptic number.

1311322220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311322220 is an abundant number, since it is smaller than the sum of its proper divisors (1654284004).

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

1311322220 is a wasteful number, since it uses less digits than its factorization.

1311322220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5043569 (or 5043567 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1311322220 is about 36212.1833089362. The cubic root of 1311322220 is about 1094.5521879110.

Adding to 1311322220 its reverse (222231131), we get a palindrome (1533553351).

The spelling of 1311322220 in words is "one billion, three hundred eleven million, three hundred twenty-two thousand, two hundred twenty".