161893207 has 12 divisors (see below), whose sum is σ = 191415576. Its totient is φ = 136488240.

The previous prime is 161893189. The next prime is 161893211. The reversal of 161893207 is 702398161.

It is a de Polignac number, because none of the positive numbers 2^k-161893207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161893007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24093 + ... + 30070.

It is an arithmetic number, because the mean of its divisors is an integer number (15951298).

Almost surely, 2^161893207 is an apocalyptic number.

161893207 is a deficient number, since it is larger than the sum of its proper divisors (29522369).

161893207 is an equidigital number, since it uses as much as digits as its factorization.

161893207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54238 (or 54231 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 161893207 is about 12723.7261444909. The cubic root of 161893207 is about 545.0163640122.

The spelling of 161893207 in words is "one hundred sixty-one million, eight hundred ninety-three thousand, two hundred seven".