161009812 has 12 divisors (see below), whose sum is σ = 282513280. Its totient is φ = 80291736.

The previous prime is 161009809. The next prime is 161009831. The reversal of 161009812 is 218900161.

It is a happy number.

It is a congruent number.

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, 51588 + ... + 54619.

Almost surely, 2^161009812 is an apocalyptic number.

It is an amenable number.

161009812 is a deficient number, since it is larger than the sum of its proper divisors (121503468).

161009812 is a wasteful number, since it uses less digits than its factorization.

161009812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106590 (or 106588 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 161009812 is about 12688.9641815240. The cubic root of 161009812 is about 544.0232337612.

Adding to 161009812 its reverse (218900161), we get a palindrome (379909973).

The spelling of 161009812 in words is "one hundred sixty-one million, nine thousand, eight hundred twelve".