231857 has 4 divisors (see below), whose sum is σ = 244080. Its totient is φ = 219636.

The previous prime is 231841. The next prime is 231859. The reversal of 231857 is 758132.

231857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231857 - 2⁴ = 231841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231859) 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, 6083 + ... + 6120.

It is an arithmetic number, because the mean of its divisors is an integer number (61020).

2²³¹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

231857 is a deficient number, since it is larger than the sum of its proper divisors (12223).

231857 is a wasteful number, since it uses less digits than its factorization.

231857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12222.

The product of its digits is 1680, while the sum is 26.

The square root of 231857 is about 481.5153164750. The cubic root of 231857 is about 61.4337091688.

Adding to 231857 its reverse (758132), we get a palindrome (989989).

The spelling of 231857 in words is "two hundred thirty-one thousand, eight hundred fifty-seven".