161204212 has 24 divisors (see below), whose sum is σ = 308794472. Its totient is φ = 73180800.

The previous prime is 161204209. The next prime is 161204213. The reversal of 161204212 is 212402161.

It can be written as a sum of positive squares in 4 ways, for example, as 8088336 + 153115876 = 2844^2 + 12374^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161204212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161204213) 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 7 ways as a sum of consecutive naturals, for example, 22239 + ... + 28582.

Almost surely, 2^161204212 is an apocalyptic number.

It is an amenable number.

161204212 is a deficient number, since it is larger than the sum of its proper divisors (147590260).

161204212 is a wasteful number, since it uses less digits than its factorization.

161204212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50899 (or 50897 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 161204212 is about 12696.6220704564. The cubic root of 161204212 is about 544.2420932630.

Adding to 161204212 its reverse (212402161), we get a palindrome (373606373).

The spelling of 161204212 in words is "one hundred sixty-one million, two hundred four thousand, two hundred twelve".