687231 has 8 divisors (see below), whose sum is σ = 1018160. Its totient is φ = 458136.

The previous prime is 687223. The next prime is 687233. The reversal of 687231 is 132786.

It is not a de Polignac number, because 687231 - 2³ = 687223 is a prime.

It is a super-2 number, since 2×687231² = 944572894722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 25453 = 687231 / (6 + 8 + 7 + 2 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687195 and 687204.

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 687231.

It is not an unprimeable number, because it can be changed into a prime (687233) 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, 12700 + ... + 12753.

It is an arithmetic number, because the mean of its divisors is an integer number (127270).

2⁶⁸⁷²³¹ is an apocalyptic number.

687231 is a deficient number, since it is larger than the sum of its proper divisors (330929).

687231 is a wasteful number, since it uses less digits than its factorization.

687231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25462 (or 25456 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 687231 is about 828.9939686150. The cubic root of 687231 is about 88.2471958063.

It can be divided in two parts, 6872 and 31, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 687231 in words is "six hundred eighty-seven thousand, two hundred thirty-one".