231257 has 4 divisors (see below), whose sum is σ = 249060. Its totient is φ = 213456.

The previous prime is 231241. The next prime is 231269. The reversal of 231257 is 752132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 143641 + 87616 = 379^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 231257 - 2⁴ = 231241 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231257.

It is not an unprimeable number, because it can be changed into a prime (231277) 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, 8882 + ... + 8907.

It is an arithmetic number, because the mean of its divisors is an integer number (62265).

2²³¹²⁵⁷ is an apocalyptic number.

It is an amenable number.

231257 is a deficient number, since it is larger than the sum of its proper divisors (17803).

231257 is a wasteful number, since it uses less digits than its factorization.

231257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17802.

The product of its digits is 420, while the sum is 20.

The square root of 231257 is about 480.8918797401. The cubic root of 231257 is about 61.3806706336.

Adding to 231257 its reverse (752132), we get a palindrome (983389).

It can be divided in two parts, 23125 and 7, that added together give a palindrome (23132).

The spelling of 231257 in words is "two hundred thirty-one thousand, two hundred fifty-seven".