161919712 has 24 divisors (see below), whose sum is σ = 320303592. Its totient is φ = 80572800.

The previous prime is 161919697. The next prime is 161919739. The reversal of 161919712 is 217919161.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

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 in 3 ways as a sum of consecutive naturals, for example, 5239 + ... + 18742.

It is an arithmetic number, because the mean of its divisors is an integer number (13345983).

Almost surely, 2^161919712 is an apocalyptic number.

It is an amenable number.

161919712 is a deficient number, since it is larger than the sum of its proper divisors (158383880).

161919712 is a wasteful number, since it uses less digits than its factorization.

161919712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24202 (or 24194 counting only the distinct ones).

The product of its digits is 6804, while the sum is 37.

The square root of 161919712 is about 12724.7676599614. The cubic root of 161919712 is about 545.0461055740.

The spelling of 161919712 in words is "one hundred sixty-one million, nine hundred nineteen thousand, seven hundred twelve".