687001 has 4 divisors (see below), whose sum is σ = 785152. Its totient is φ = 588852.

The previous prime is 686993. The next prime is 687007. The reversal of 687001 is 100786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 687001 - 2³ = 686993 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49065 + ... + 49078.

It is an arithmetic number, because the mean of its divisors is an integer number (196288).

2⁶⁸⁷⁰⁰¹ is an apocalyptic number.

It is an amenable number.

687001 is a deficient number, since it is larger than the sum of its proper divisors (98151).

687001 is an equidigital number, since it uses as much as digits as its factorization.

687001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98150.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 687001 is about 828.8552346460. The cubic root of 687001 is about 88.2373499565.

Adding to 687001 its reverse (100786), we get a palindrome (787787).

The spelling of 687001 in words is "six hundred eighty-seven thousand, one".