687523 has 2 divisors, whose sum is σ = 687524. Its totient is φ = 687522.

The previous prime is 687521. The next prime is 687541. The reversal of 687523 is 325786.

It is a weak prime.

687523 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 687523 - 2¹ = 687521 is a prime.

Together with 687521, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 6⁷ + 8² + 5⁸ + 7⁵ + 2⁶ + 3³ .

687523 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (687521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343761 + 343762.

It is an arithmetic number, because the mean of its divisors is an integer number (343762).

2⁶⁸⁷⁵²³ is an apocalyptic number.

687523 is a deficient number, since it is larger than the sum of its proper divisors (1).

687523 is an equidigital number, since it uses as much as digits as its factorization.

687523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 687523 is about 829.1700669947. The cubic root of 687523 is about 88.2596925905.

The spelling of 687523 in words is "six hundred eighty-seven thousand, five hundred twenty-three".