181143612 has 144 divisors (see below), whose sum is σ = 514594080. Its totient is φ = 53374464.

The previous prime is 181143583. The next prime is 181143637. The reversal of 181143612 is 216341181.

It is a happy number.

181143612 is a `hidden beast` number, since 1 + 8 + 1 + 1 + 43 + 612 = 666.

181143612 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1661814 + ... + 1661922.

It is an arithmetic number, because the mean of its divisors is an integer number (3573570).

Almost surely, 2^181143612 is an apocalyptic number.

181143612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181143612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257297040).

181143612 is an abundant number, since it is smaller than the sum of its proper divisors (333450468).

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

181143612 is a wasteful number, since it uses less digits than its factorization.

181143612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 247 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 181143612 is about 13458.9602867383. The cubic root of 181143612 is about 565.8148495192.

Adding to 181143612 its reverse (216341181), we get a palindrome (397484793).

The spelling of 181143612 in words is "one hundred eighty-one million, one hundred forty-three thousand, six hundred twelve".