161871 has 8 divisors (see below), whose sum is σ = 218880. Its totient is φ = 106392.

The previous prime is 161869. The next prime is 161873. The reversal of 161871 is 178161.

It is an interprime number because it is at equal distance from previous prime (161869) and next prime (161873).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161871 - 2¹ = 161869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105 + ... + 578.

It is an arithmetic number, because the mean of its divisors is an integer number (27360).

2¹⁶¹⁸⁷¹ is an apocalyptic number.

161871 is a deficient number, since it is larger than the sum of its proper divisors (57009).

161871 is an equidigital number, since it uses as much as digits as its factorization.

161871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765.

The product of its digits is 336, while the sum is 24.

The square root of 161871 is about 402.3319524969. The cubic root of 161871 is about 54.4991442786.

Subtracting 161871 from its reverse (178161), we obtain a triangular number (16290 = T₁₈₀).

The spelling of 161871 in words is "one hundred sixty-one thousand, eight hundred seventy-one".