197871 has 4 divisors (see below), whose sum is σ = 263832. Its totient is φ = 131912.

The previous prime is 197837. The next prime is 197887. The reversal of 197871 is 178791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 197871 - 2⁶ = 197807 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197831) 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, 32976 + ... + 32981.

It is an arithmetic number, because the mean of its divisors is an integer number (65958).

2¹⁹⁷⁸⁷¹ is an apocalyptic number.

197871 is a deficient number, since it is larger than the sum of its proper divisors (65961).

197871 is an equidigital number, since it uses as much as digits as its factorization.

197871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65960.

The product of its digits is 3528, while the sum is 33.

The square root of 197871 is about 444.8269326379. The cubic root of 197871 is about 58.2721062797.

The spelling of 197871 in words is "one hundred ninety-seven thousand, eight hundred seventy-one".