685885099 has 2 divisors, whose sum is σ = 685885100. Its totient is φ = 685885098.

The previous prime is 685885091. The next prime is 685885103. The reversal of 685885099 is 990588586.

It is a happy number.

685885099 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 685885099 - 2³ = 685885091 is a prime.

It is not a weakly prime, because it can be changed into another prime (685885091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342942549 + 342942550.

It is an arithmetic number, because the mean of its divisors is an integer number (342942550).

Almost surely, 2^685885099 is an apocalyptic number.

685885099 is a deficient number, since it is larger than the sum of its proper divisors (1).

685885099 is an equidigital number, since it uses as much as digits as its factorization.

685885099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6220800, while the sum is 58.

The square root of 685885099 is about 26189.4081452789. The cubic root of 685885099 is about 881.8954919768.

The spelling of 685885099 in words is "six hundred eighty-five million, eight hundred eighty-five thousand, ninety-nine".