1131020320 has 48 divisors (see below), whose sum is σ = 2684102400. Its totient is φ = 450365184.

The previous prime is 1131020243. The next prime is 1131020339. The reversal of 1131020320 is 230201311.

It is a self number, because there is not a number n which added to its sum of digits gives 1131020320.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19831 + ... + 51529.

It is an arithmetic number, because the mean of its divisors is an integer number (55918800).

Almost surely, 2^1131020320 is an apocalyptic number.

1131020320 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 1131020320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1342051200).

1131020320 is an abundant number, since it is smaller than the sum of its proper divisors (1553082080).

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

1131020320 is a wasteful number, since it uses less digits than its factorization.

1131020320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31937 (or 31929 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1131020320 is about 33630.6455483685. The cubic root of 1131020320 is about 1041.8938372026.

Adding to 1131020320 its reverse (230201311), we get a palindrome (1361221631).

The spelling of 1131020320 in words is "one billion, one hundred thirty-one million, twenty thousand, three hundred twenty".