181209412 has 12 divisors (see below), whose sum is σ = 317311596. Its totient is φ = 90548960.

The previous prime is 181209401. The next prime is 181209421. The reversal of 181209412 is 214902181.

It can be written as a sum of positive squares in 2 ways, for example, as 104366656 + 76842756 = 10216^2 + 8766^2 .

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 3 ways as a sum of consecutive naturals, for example, 6139 + ... + 20002.

It is an arithmetic number, because the mean of its divisors is an integer number (26442633).

Almost surely, 2^181209412 is an apocalyptic number.

It is an amenable number.

181209412 is a deficient number, since it is larger than the sum of its proper divisors (136102184).

181209412 is a wasteful number, since it uses less digits than its factorization.

181209412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27878 (or 27876 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 181209412 is about 13461.4045329601. The cubic root of 181209412 is about 565.8833515393.

The spelling of 181209412 in words is "one hundred eighty-one million, two hundred nine thousand, four hundred twelve".