1131223020 has 48 divisors (see below), whose sum is σ = 3173856000. Its totient is φ = 301046976.

The previous prime is 1131223013. The next prime is 1131223033. The reversal of 1131223020 is 203221311.

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

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 15 ways as a sum of consecutive naturals, for example, 11049 + ... + 48831.

It is an arithmetic number, because the mean of its divisors is an integer number (66122000).

Almost surely, 2^1131223020 is an apocalyptic number.

1131223020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131223020 is an abundant number, since it is smaller than the sum of its proper divisors (2042632980).

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

1131223020 is a wasteful number, since it uses less digits than its factorization.

1131223020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38294 (or 38292 counting only the distinct ones).

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

The square root of 1131223020 is about 33633.6590337715. The cubic root of 1131223020 is about 1041.9560757737.

Adding to 1131223020 its reverse (203221311), we get a palindrome (1334444331).

The spelling of 1131223020 in words is "one billion, one hundred thirty-one million, two hundred twenty-three thousand, twenty".