161900171 has 2 divisors, whose sum is σ = 161900172. Its totient is φ = 161900170.

The previous prime is 161900143. The next prime is 161900177. The reversal of 161900171 is 171009161.

161900171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161900171 - 2¹⁰ = 161899147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161900171.

It is not a weakly prime, because it can be changed into another prime (161900177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80950085 + 80950086.

It is an arithmetic number, because the mean of its divisors is an integer number (80950086).

Almost surely, 2^161900171 is an apocalyptic number.

161900171 is a deficient number, since it is larger than the sum of its proper divisors (1).

161900171 is an equidigital number, since it uses as much as digits as its factorization.

161900171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 26.

The square root of 161900171 is about 12723.9998035209. Note that the first 3 decimals coincide. The cubic root of 161900171 is about 545.0241787102.

The spelling of 161900171 in words is "one hundred sixty-one million, nine hundred thousand, one hundred seventy-one".