687241 has 3 divisors (see below), whose sum is σ = 688071. Its totient is φ = 686412.

The previous prime is 687233. The next prime is 687277. The reversal of 687241 is 142786.

The square root of 687241 is 829.

It is a perfect power (a square), and thus also a powerful number.

687241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 395641 + 291600 = 629^2 + 540^2 .

It is not a de Polignac number, because 687241 - 2³ = 687233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687041) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 415 + ... + 1243.

It is an arithmetic number, because the mean of its divisors is an integer number (229357).

687241 is a Friedman number, since it can be written as (846-17)^2, using all its digits and the basic arithmetic operations.

2⁶⁸⁷²⁴¹ is an apocalyptic number.

687241 is the 829-th square number.

687241 is the 415-th centered octagonal number.

It is an amenable number.

687241 is a deficient number, since it is larger than the sum of its proper divisors (830).

687241 is an frugal number, since it uses more digits than its factorization.

687241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658 (or 829 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The cubic root of 687241 is about 88.2476238369.

The spelling of 687241 in words is "six hundred eighty-seven thousand, two hundred forty-one".