181912012 has 12 divisors (see below), whose sum is σ = 329323680. Its totient is φ = 87819536.

The previous prime is 181912007. The next prime is 181912021. The reversal of 181912012 is 210219181.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783988 + ... + 784219.

It is an arithmetic number, because the mean of its divisors is an integer number (27443640).

Almost surely, 2^181912012 is an apocalyptic number.

It is an amenable number.

181912012 is a deficient number, since it is larger than the sum of its proper divisors (147411668).

181912012 is a wasteful number, since it uses less digits than its factorization.

181912012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568240 (or 1568238 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 181912012 is about 13487.4761167536. The cubic root of 181912012 is about 566.6137714564.

It can be divided in two parts, 1819 and 12012, that added together give a palindrome (13831).

The spelling of 181912012 in words is "one hundred eighty-one million, nine hundred twelve thousand, twelve".