1123155200 has 54 divisors (see below), whose sum is σ = 2780000454. Its totient is φ = 449259520.

The previous prime is 1123155199. The next prime is 1123155221. The reversal of 1123155200 is 25513211.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 21977344 + 1101177856 = 4688^2 + 33184^2 .

It is a super-2 number, since 2×1123155200² = 2522955206574080000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 81347 + ... + 94146.

Almost surely, 2^1123155200 is an apocalyptic number.

1123155200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123155200 is an abundant number, since it is smaller than the sum of its proper divisors (1656845254).

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

1123155200 is an equidigital number, since it uses as much as digits as its factorization.

1123155200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175519 (or 175500 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1123155200 is about 33513.5077244982. The cubic root of 1123155200 is about 1039.4731058863.

Adding to 1123155200 its reverse (25513211), we get a palindrome (1148668411).

The spelling of 1123155200 in words is "one billion, one hundred twenty-three million, one hundred fifty-five thousand, two hundred".