231287 has 16 divisors (see below), whose sum is σ = 291840. Its totient is φ = 178848.

The previous prime is 231277. The next prime is 231289. The reversal of 231287 is 782132.

231287 is nontrivially palindromic in base 12.

It is a cyclic number.

It is not a de Polignac number, because 231287 - 2⁴ = 231271 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231287.

It is not an unprimeable number, because it can be changed into a prime (231289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4898 + ... + 4944.

It is an arithmetic number, because the mean of its divisors is an integer number (18240).

2²³¹²⁸⁷ is an apocalyptic number.

231287 is a deficient number, since it is larger than the sum of its proper divisors (60553).

231287 is a wasteful number, since it uses less digits than its factorization.

231287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110.

The product of its digits is 672, while the sum is 23.

The square root of 231287 is about 480.9230707712. The cubic root of 231287 is about 61.3833247378.

The spelling of 231287 in words is "two hundred thirty-one thousand, two hundred eighty-seven".