81118150 has 24 divisors (see below), whose sum is σ = 152383104. Its totient is φ = 32124000.

The previous prime is 81118123. The next prime is 81118151. The reversal of 81118150 is 5181118.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81118151) 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, 2982 + ... + 13081.

It is an arithmetic number, because the mean of its divisors is an integer number (6349296).

Almost surely, 2^81118150 is an apocalyptic number.

81118150 is a deficient number, since it is larger than the sum of its proper divisors (71264954).

81118150 is a wasteful number, since it uses less digits than its factorization.

81118150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16176 (or 16171 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 25.

The square root of 81118150 is about 9006.5614970420. The cubic root of 81118150 is about 432.8851414652.

Adding to 81118150 its reverse (5181118), we get a palindrome (86299268).

It can be divided in two parts, 8111 and 8150, that added together give a palindrome (16261).

The spelling of 81118150 in words is "eighty-one million, one hundred eighteen thousand, one hundred fifty".