161893671 has 4 divisors (see below), whose sum is σ = 215858232. Its totient is φ = 107929112.

The previous prime is 161893657. The next prime is 161893681. The reversal of 161893671 is 176398161.

161893671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176398161 = 3 ⋅58799387.

It is a cyclic number.

It is not a de Polignac number, because 161893671 - 2¹⁸ = 161631527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161893651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26982276 + ... + 26982281.

It is an arithmetic number, because the mean of its divisors is an integer number (53964558).

Almost surely, 2^161893671 is an apocalyptic number.

161893671 is a deficient number, since it is larger than the sum of its proper divisors (53964561).

161893671 is an equidigital number, since it uses as much as digits as its factorization.

161893671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53964560.

The product of its digits is 54432, while the sum is 42.

The square root of 161893671 is about 12723.7443781302. The cubic root of 161893671 is about 545.0168846998.

The spelling of 161893671 in words is "one hundred sixty-one million, eight hundred ninety-three thousand, six hundred seventy-one".