1123545500 has 216 divisors, whose sum is σ = 3145811760. Its totient is φ = 349272000.

The previous prime is 1123545497. The next prime is 1123545503. The reversal of 1123545500 is 55453211.

It is an interprime number because it is at equal distance from previous prime (1123545497) and next prime (1123545503).

It is a self number, because there is not a number n which added to its sum of digits gives 1123545500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123545503) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2964311 + ... + 2964689.

Almost surely, 2^1123545500 is an apocalyptic number.

1123545500 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 1123545500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1572905880).

1123545500 is an abundant number, since it is smaller than the sum of its proper divisors (2022266260).

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

1123545500 is a wasteful number, since it uses less digits than its factorization.

1123545500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 1123545500 is about 33519.3302439055. The cubic root of 1123545500 is about 1039.5934986773.

Adding to 1123545500 its reverse (55453211), we get a palindrome (1178998711).

The spelling of 1123545500 in words is "one billion, one hundred twenty-three million, five hundred forty-five thousand, five hundred".