161989112 has 8 divisors (see below), whose sum is σ = 303729600. Its totient is φ = 80994552.

The previous prime is 161989111. The next prime is 161989129. The reversal of 161989112 is 211989161.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161989111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10124312 + ... + 10124327.

It is an arithmetic number, because the mean of its divisors is an integer number (37966200).

Almost surely, 2^161989112 is an apocalyptic number.

It is an amenable number.

161989112 is a deficient number, since it is larger than the sum of its proper divisors (141740488).

161989112 is a wasteful number, since it uses less digits than its factorization.

161989112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20248645 (or 20248641 counting only the distinct ones).

The product of its digits is 7776, while the sum is 38.

The square root of 161989112 is about 12727.4943331356. The cubic root of 161989112 is about 545.1239647310.

The spelling of 161989112 in words is "one hundred sixty-one million, nine hundred eighty-nine thousand, one hundred twelve".