161771 has 2 divisors, whose sum is σ = 161772. Its totient is φ = 161770.

The previous prime is 161761. The next prime is 161773. The reversal of 161771 is 177161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161771 is a prime.

Together with 161773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161773) by changing a digit.

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 as a sum of consecutive naturals, namely, 80885 + 80886.

It is an arithmetic number, because the mean of its divisors is an integer number (80886).

2¹⁶¹⁷⁷¹ is an apocalyptic number.

161771 is a deficient number, since it is larger than the sum of its proper divisors (1).

161771 is an equidigital number, since it uses as much as digits as its factorization.

161771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 294, while the sum is 23.

The square root of 161771 is about 402.2076578087. The cubic root of 161771 is about 54.4879192144.

The spelling of 161771 in words is "one hundred sixty-one thousand, seven hundred seventy-one".