685759199 has 2 divisors, whose sum is σ = 685759200. Its totient is φ = 685759198.

The previous prime is 685759181. The next prime is 685759213. The reversal of 685759199 is 991957586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685759199 - 2⁸ = 685758943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685759699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342879599 + 342879600.

It is an arithmetic number, because the mean of its divisors is an integer number (342879600).

Almost surely, 2^685759199 is an apocalyptic number.

685759199 is a deficient number, since it is larger than the sum of its proper divisors (1).

685759199 is an equidigital number, since it uses as much as digits as its factorization.

685759199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6123600, while the sum is 59.

The square root of 685759199 is about 26187.0043914916. The cubic root of 685759199 is about 881.8415288875.

The spelling of 685759199 in words is "six hundred eighty-five million, seven hundred fifty-nine thousand, one hundred ninety-nine".