687133 has 4 divisors (see below), whose sum is σ = 688828. Its totient is φ = 685440.

The previous prime is 687131. The next prime is 687139. The reversal of 687133 is 331786.

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 311364 + 375769 = 558^2 + 613^2 .

It is a cyclic number.

It is not a de Polignac number, because 687133 - 2¹ = 687131 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163 + ... + 1183.

It is an arithmetic number, because the mean of its divisors is an integer number (172207).

2⁶⁸⁷¹³³ is an apocalyptic number.

It is an amenable number.

687133 is a deficient number, since it is larger than the sum of its proper divisors (1695).

687133 is a wasteful number, since it uses less digits than its factorization.

687133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694.

The product of its digits is 3024, while the sum is 28.

The square root of 687133 is about 828.9348587193. The cubic root of 687133 is about 88.2430008868.

It can be divided in two parts, 687 and 133, that added together give a triangular number (820 = T₄₀).

The spelling of 687133 in words is "six hundred eighty-seven thousand, one hundred thirty-three".