685099 has 2 divisors, whose sum is σ = 685100. Its totient is φ = 685098.

The previous prime is 685093. The next prime is 685103. The reversal of 685099 is 990586.

685099 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685099 - 2⁹ = 684587 is a prime.

685099 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (685093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342549 + 342550.

It is an arithmetic number, because the mean of its divisors is an integer number (342550).

2⁶⁸⁵⁰⁹⁹ is an apocalyptic number.

685099 is a deficient number, since it is larger than the sum of its proper divisors (1).

685099 is an equidigital number, since it uses as much as digits as its factorization.

685099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 685099 is about 827.7070737888. The cubic root of 685099 is about 88.1558447097.

The spelling of 685099 in words is "six hundred eighty-five thousand, ninety-nine".