181533116 has 12 divisors (see below), whose sum is σ = 318072888. Its totient is φ = 90655152.

The previous prime is 181533113. The next prime is 181533139. The reversal of 181533116 is 611335181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181533113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24131 + ... + 30746.

It is an arithmetic number, because the mean of its divisors is an integer number (26506074).

Almost surely, 2^181533116 is an apocalyptic number.

It is an amenable number.

181533116 is a deficient number, since it is larger than the sum of its proper divisors (136539772).

181533116 is a wasteful number, since it uses less digits than its factorization.

181533116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55708 (or 55706 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The square root of 181533116 is about 13473.4225792855. The cubic root of 181533116 is about 566.2201069292.

Adding to 181533116 its reverse (611335181), we get a palindrome (792868297).

The spelling of 181533116 in words is "one hundred eighty-one million, five hundred thirty-three thousand, one hundred sixteen".