1113311220 has 96 divisors (see below), whose sum is σ = 3570567168. Its totient is φ = 253901952.

The previous prime is 1113311207. The next prime is 1113311233. The reversal of 1113311220 is 221133111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1113311207) and next prime (1113311233).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1113311220.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 201819 + ... + 207261.

It is an arithmetic number, because the mean of its divisors is an integer number (37193408).

Almost surely, 2^1113311220 is an apocalyptic number.

1113311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1113311220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1785283584).

1113311220 is an abundant number, since it is smaller than the sum of its proper divisors (2457255948).

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

1113311220 is a wasteful number, since it uses less digits than its factorization.

1113311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5949 (or 5947 counting only the distinct ones).

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

The square root of 1113311220 is about 33366.3186462037. The cubic root of 1113311220 is about 1036.4273429178.

Adding to 1113311220 its reverse (221133111), we get a palindrome (1334444331).

The spelling of 1113311220 in words is "one billion, one hundred thirteen million, three hundred eleven thousand, two hundred twenty".