857231 has 4 divisors (see below), whose sum is σ = 862200. Its totient is φ = 852264.

The previous prime is 857221. The next prime is 857249. The reversal of 857231 is 132758.

857231 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.

It is a cyclic number.

It is not a de Polignac number, because 857231 - 2⁶ = 857167 is a prime.

It is a super-2 number, since 2×857231² = 1469689974722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 857231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857201) 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, 2216 + ... + 2573.

It is an arithmetic number, because the mean of its divisors is an integer number (215550).

2⁸⁵⁷²³¹ is an apocalyptic number.

857231 is a deficient number, since it is larger than the sum of its proper divisors (4969).

857231 is a wasteful number, since it uses less digits than its factorization.

857231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4968.

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

The square root of 857231 is about 925.8677011323. The cubic root of 857231 is about 94.9946811427.

Adding to 857231 its reverse (132758), we get a palindrome (989989).

The spelling of 857231 in words is "eight hundred fifty-seven thousand, two hundred thirty-one".