287331 has 8 divisors (see below), whose sum is σ = 417984. Its totient is φ = 174120.

The previous prime is 287327. The next prime is 287333. The reversal of 287331 is 133782.

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

It is not a de Polignac number, because 287331 - 2² = 287327 is a prime.

It is a super-2 number, since 2×287331² = 165118207122, which contains 22 as substring.

287331 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287333) 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, 4321 + ... + 4386.

It is an arithmetic number, because the mean of its divisors is an integer number (52248).

2²⁸⁷³³¹ is an apocalyptic number.

287331 is a deficient number, since it is larger than the sum of its proper divisors (130653).

287331 is a wasteful number, since it uses less digits than its factorization.

287331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8721.

The product of its digits is 1008, while the sum is 24.

The square root of 287331 is about 536.0326482594. The cubic root of 287331 is about 65.9873713211.

The spelling of 287331 in words is "two hundred eighty-seven thousand, three hundred thirty-one".