1131220320 has 96 divisors (see below), whose sum is σ = 3576998880. Its totient is φ = 300503040.

The previous prime is 1131220303. The next prime is 1131220333. The reversal of 1131220320 is 230221311.

It is a tau number, because it is divible by the number of its divisors (96).

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 1131220320.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 124740 + ... + 133500.

It is an arithmetic number, because the mean of its divisors is an integer number (37260405).

Almost surely, 2^1131220320 is an apocalyptic number.

1131220320 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 1131220320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1788499440).

1131220320 is an abundant number, since it is smaller than the sum of its proper divisors (2445778560).

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

1131220320 is a wasteful number, since it uses less digits than its factorization.

1131220320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9048 (or 9040 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1131220320 is about 33633.6188953850. The cubic root of 1131220320 is about 1041.9552467937.

Adding to 1131220320 its reverse (230221311), we get a palindrome (1361441631).

Subtracting from 1131220320 its reverse (230221311), we obtain a palindrome (900999009).

The spelling of 1131220320 in words is "one billion, one hundred thirty-one million, two hundred twenty thousand, three hundred twenty".