161992012 has 24 divisors (see below), whose sum is σ = 348906656. Its totient is φ = 64084608.

The previous prime is 161992007. The next prime is 161992063. The reversal of 161992012 is 210299161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222153 + ... + 222880.

Almost surely, 2^161992012 is an apocalyptic number.

It is an amenable number.

161992012 is an abundant number, since it is smaller than the sum of its proper divisors (186914644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161992012 is a wasteful number, since it uses less digits than its factorization.

161992012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445057 (or 445055 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 161992012 is about 12727.6082592135. The cubic root of 161992012 is about 545.1272177275.

The spelling of 161992012 in words is "one hundred sixty-one million, nine hundred ninety-two thousand, twelve".