81118000 has 40 divisors (see below), whose sum is σ = 196148160. Its totient is φ = 32446400.

The previous prime is 81117989. The next prime is 81118003. The reversal of 81118000 is 81118.

81118000 is nontrivially palindromic in base 9.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (81118003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18280 + ... + 22279.

It is an arithmetic number, because the mean of its divisors is an integer number (4903704).

Almost surely, 2^81118000 is an apocalyptic number.

81118000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81118000 is an abundant number, since it is smaller than the sum of its proper divisors (115030160).

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

81118000 is a wasteful number, since it uses less digits than its factorization.

81118000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40582 (or 40566 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 81118000 is about 9006.5531697759. The cubic root of 81118000 is about 432.8848746411.

Adding to 81118000 its reverse (81118), we get a palindrome (81199118).

81118000 divided by its reverse (81118) gives a cube (1000 = 10³).

The spelling of 81118000 in words is "eighty-one million, one hundred eighteen thousand".