1131805500 has 96 divisors (see below), whose sum is σ = 3766683648. Its totient is φ = 258696000.

The previous prime is 1131805487. The next prime is 1131805501. The reversal of 1131805500 is 55081311.

It is a super-4 number, since 4×1131805500⁴ (a number of 37 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131805501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43396 + ... + 64395.

It is an arithmetic number, because the mean of its divisors is an integer number (39236288).

Almost surely, 2^1131805500 is an apocalyptic number.

1131805500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131805500 is an abundant number, since it is smaller than the sum of its proper divisors (2634878148).

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

1131805500 is a wasteful number, since it uses less digits than its factorization.

1131805500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107820 (or 107808 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 1131805500 is about 33642.3171021260. The cubic root of 1131805500 is about 1042.1348835549.

Adding to 1131805500 its reverse (55081311), we get a palindrome (1186886811).

The spelling of 1131805500 in words is "one billion, one hundred thirty-one million, eight hundred five thousand, five hundred".