181031323212 has 36 divisors (see below), whose sum is σ = 458307791760. Its totient is φ = 60251356512.

The previous prime is 181031323211. The next prime is 181031323217. The reversal of 181031323212 is 212323130181.

181031323212 is a `hidden beast` number, since 18 + 10 + 313 + 2 + 321 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (181031323211) 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 11 ways as a sum of consecutive naturals, for example, 3826912 + ... + 3873927.

Almost surely, 2^181031323212 is an apocalyptic number.

181031323212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181031323212 is an abundant number, since it is smaller than the sum of its proper divisors (277276468548).

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

181031323212 is a wasteful number, since it uses less digits than its factorization.

181031323212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7701502 (or 7701497 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 181031323212 its reverse (212323130181), we get a palindrome (393354453393).

The spelling of 181031323212 in words is "one hundred eighty-one billion, thirty-one million, three hundred twenty-three thousand, two hundred twelve".