686563 has 2 divisors, whose sum is σ = 686564. Its totient is φ = 686562.

The previous prime is 686551. The next prime is 686593. The reversal of 686563 is 365686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 686563 - 2⁹ = 686051 is a prime.

It is not a weakly prime, because it can be changed into another prime (686503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343281 + 343282.

It is an arithmetic number, because the mean of its divisors is an integer number (343282).

2⁶⁸⁶⁵⁶³ is an apocalyptic number.

686563 is a deficient number, since it is larger than the sum of its proper divisors (1).

686563 is an equidigital number, since it uses as much as digits as its factorization.

686563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 686563 is about 828.5909726759. The cubic root of 686563 is about 88.2185939549.

The spelling of 686563 in words is "six hundred eighty-six thousand, five hundred sixty-three".