287231 has 8 divisors (see below), whose sum is σ = 337440. Its totient is φ = 239328.

The previous prime is 287219. The next prime is 287233. The reversal of 287231 is 132782.

287231 is nontrivially palindromic in base 14.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 287231 - 2⁶ = 287167 is a prime.

It is a super-2 number, since 2×287231² = 165003294722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 287197 and 287206.

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 287231.

It is not an unprimeable number, because it can be changed into a prime (287233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296 + ... + 813.

It is an arithmetic number, because the mean of its divisors is an integer number (42180).

2²⁸⁷²³¹ is an apocalyptic number.

287231 is a deficient number, since it is larger than the sum of its proper divisors (50209).

287231 is a wasteful number, since it uses less digits than its factorization.

287231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153.

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

The square root of 287231 is about 535.9393622417. The cubic root of 287231 is about 65.9797152232.

Subtracting from 287231 its reverse (132782), we obtain a square (154449 = 393²).

The spelling of 287231 in words is "two hundred eighty-seven thousand, two hundred thirty-one".