81118200 has 48 divisors (see below), whose sum is σ = 251468280. Its totient is φ = 21631360.

The previous prime is 81118199. The next prime is 81118207. The reversal of 81118200 is 281118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81118207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66999 + ... + 68198.

Almost surely, 2^81118200 is an apocalyptic number.

It is an amenable number.

81118200 is an abundant number, since it is smaller than the sum of its proper divisors (170350080).

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

81118200 is a wasteful number, since it uses less digits than its factorization.

81118200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135216 (or 135207 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 81118200 is about 9006.5642727957. The cubic root of 81118200 is about 432.8852304064.

Adding to 81118200 its reverse (281118), we get a palindrome (81399318).

It can be divided in two parts, 81118 and 200, that added together give a palindrome (81318).

The spelling of 81118200 in words is "eighty-one million, one hundred eighteen thousand, two hundred".