686503 has 2 divisors, whose sum is σ = 686504. Its totient is φ = 686502.

The previous prime is 686479. The next prime is 686513. The reversal of 686503 is 305686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686503 - 2⁹ = 685991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343251 + 343252.

It is an arithmetic number, because the mean of its divisors is an integer number (343252).

2⁶⁸⁶⁵⁰³ is an apocalyptic number.

686503 is a deficient number, since it is larger than the sum of its proper divisors (1).

686503 is an equidigital number, since it uses as much as digits as its factorization.

686503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 686503 is about 828.5547658423. The cubic root of 686503 is about 88.2160240184.

The spelling of 686503 in words is "six hundred eighty-six thousand, five hundred three".