231571 has 2 divisors, whose sum is σ = 231572. Its totient is φ = 231570.

The previous prime is 231563. The next prime is 231589. The reversal of 231571 is 175132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231571 - 2³ = 231563 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (231551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115785 + 115786.

It is an arithmetic number, because the mean of its divisors is an integer number (115786).

2²³¹⁵⁷¹ is an apocalyptic number.

231571 is a deficient number, since it is larger than the sum of its proper divisors (1).

231571 is an equidigital number, since it uses as much as digits as its factorization.

231571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 210, while the sum is 19.

The square root of 231571 is about 481.2182457056. The cubic root of 231571 is about 61.4084388943.

Subtracting from 231571 its product of digits (210), we obtain a square (231361 = 481²).

The spelling of 231571 in words is "two hundred thirty-one thousand, five hundred seventy-one".