9811538500 has 48 divisors (see below), whose sum is σ = 21443490432. Its totient is φ = 3921852000.

The previous prime is 9811538483. The next prime is 9811538507. The reversal of 9811538500 is 58351189.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (9811538507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 797395 + ... + 809605.

It is an arithmetic number, because the mean of its divisors is an integer number (446739384).

Almost surely, 2^9811538500 is an apocalyptic number.

It is an amenable number.

9811538500 is an abundant number, since it is smaller than the sum of its proper divisors (11631951932).

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

9811538500 is a wasteful number, since it uses less digits than its factorization.

9811538500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13837 (or 13825 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 9811538500 is about 99053.2104477185. The cubic root of 9811538500 is about 2140.8144991102.

Adding to 9811538500 its reverse (58351189), we get a palindrome (9869889689).

The spelling of 9811538500 in words is "nine billion, eight hundred eleven million, five hundred thirty-eight thousand, five hundred".