161504212 has 6 divisors (see below), whose sum is σ = 282632378. Its totient is φ = 80752104.

The previous prime is 161504201. The next prime is 161504227. The reversal of 161504212 is 212405161.

It can be written as a sum of positive squares in only one way, i.e., 113976976 + 47527236 = 10676^2 + 6894^2 .

It is a super-2 number, since 2×161504212² = 52167220987481888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20188023 + ... + 20188030.

Almost surely, 2^161504212 is an apocalyptic number.

It is an amenable number.

161504212 is a deficient number, since it is larger than the sum of its proper divisors (121128166).

161504212 is a wasteful number, since it uses less digits than its factorization.

161504212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40376057 (or 40376055 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 161504212 is about 12708.4307449819. The cubic root of 161504212 is about 544.5794943922.

Adding to 161504212 its reverse (212405161), we get a palindrome (373909373).

The spelling of 161504212 in words is "one hundred sixty-one million, five hundred four thousand, two hundred twelve".