231871 has 2 divisors, whose sum is σ = 231872. Its totient is φ = 231870.

The previous prime is 231859. The next prime is 231877. The reversal of 231871 is 178132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231871 - 2⁵ = 231839 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115935 + 115936.

It is an arithmetic number, because the mean of its divisors is an integer number (115936).

2²³¹⁸⁷¹ is an apocalyptic number.

231871 is a deficient number, since it is larger than the sum of its proper divisors (1).

231871 is an equidigital number, since it uses as much as digits as its factorization.

231871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 22.

The square root of 231871 is about 481.5298536955. The cubic root of 231871 is about 61.4349456416.

The spelling of 231871 in words is "two hundred thirty-one thousand, eight hundred seventy-one".