1131223500 has 144 divisors (see below), whose sum is σ = 3893224608. Its totient is φ = 274224000.

The previous prime is 1131223493. The next prime is 1131223523. The reversal of 1131223500 is 53221311.

1131223500 is a `hidden beast` number, since 1 + 1 + 312 + 2 + 350 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38074 + ... + 60926.

It is an arithmetic number, because the mean of its divisors is an integer number (27036282).

Almost surely, 2^1131223500 is an apocalyptic number.

1131223500 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 1131223500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1946612304).

1131223500 is an abundant number, since it is smaller than the sum of its proper divisors (2762001108).

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

1131223500 is a wasteful number, since it uses less digits than its factorization.

1131223500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22889 (or 22874 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1131223500 is about 33633.6661694797. Note that the first 3 decimals coincide. The cubic root of 1131223500 is about 1041.9562231477.

Adding to 1131223500 its reverse (53221311), we get a palindrome (1184444811).

The spelling of 1131223500 in words is "one billion, one hundred thirty-one million, two hundred twenty-three thousand, five hundred".