181381212 has 36 divisors (see below), whose sum is σ = 469677936. Its totient is φ = 58985280.

The previous prime is 181381099. The next prime is 181381247. The reversal of 181381212 is 212183181.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59968 + ... + 62919.

Almost surely, 2^181381212 is an apocalyptic number.

181381212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181381212 is an abundant number, since it is smaller than the sum of its proper divisors (288296724).

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

181381212 is a wasteful number, since it uses less digits than its factorization.

181381212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122938 (or 122933 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 181381212 is about 13467.7842275558. The cubic root of 181381212 is about 566.0621282215.

The spelling of 181381212 in words is "one hundred eighty-one million, three hundred eighty-one thousand, two hundred twelve".