1131200100 has 144 divisors (see below), whose sum is σ = 3762259200. Its totient is φ = 291231360.

The previous prime is 1131200087. The next prime is 1131200123. The reversal of 1131200100 is 10021311.

1131200100 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1131200100² = 2559227332480020000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

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, 71077 + ... + 85523.

It is an arithmetic number, because the mean of its divisors is an integer number (26126800).

Almost surely, 2^1131200100 is an apocalyptic number.

1131200100 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 1131200100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1881129600).

1131200100 is an abundant number, since it is smaller than the sum of its proper divisors (2631059100).

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

1131200100 is a wasteful number, since it uses less digits than its factorization.

1131200100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14499 (or 14486 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1131200100 is about 33633.3183019458. The cubic root of 1131200100 is about 1041.9490386130.

Adding to 1131200100 its reverse (10021311), we get a palindrome (1141221411).

The spelling of 1131200100 in words is "one billion, one hundred thirty-one million, two hundred thousand, one hundred".