1121543500 has 96 divisors (see below), whose sum is σ = 3053965824. Its totient is φ = 349560000.

The previous prime is 1121543497. The next prime is 1121543537. The reversal of 1121543500 is 53451211.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23935 + ... + 53065.

It is an arithmetic number, because the mean of its divisors is an integer number (31812144).

Almost surely, 2^1121543500 is an apocalyptic number.

1121543500 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 1121543500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1526982912).

1121543500 is an abundant number, since it is smaller than the sum of its proper divisors (1932422324).

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

1121543500 is a wasteful number, since it uses less digits than its factorization.

1121543500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29168 (or 29156 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1121543500 is about 33489.4535637714. The cubic root of 1121543500 is about 1038.9756617838.

Adding to 1121543500 its reverse (53451211), we get a palindrome (1174994711).

The spelling of 1121543500 in words is "one billion, one hundred twenty-one million, five hundred forty-three thousand, five hundred".