685397071 has 4 divisors (see below), whose sum is σ = 687587152. Its totient is φ = 683206992.

The previous prime is 685397059. The next prime is 685397117. The reversal of 685397071 is 170793586.

685397071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 685397071 - 2¹¹ = 685395023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685397021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094571 + ... + 1095196.

It is an arithmetic number, because the mean of its divisors is an integer number (171896788).

Almost surely, 2^685397071 is an apocalyptic number.

685397071 is a deficient number, since it is larger than the sum of its proper divisors (2190081).

685397071 is a wasteful number, since it uses less digits than its factorization.

685397071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190080.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 685397071 is about 26180.0892091681. The cubic root of 685397071 is about 881.6862772397.

The spelling of 685397071 in words is "six hundred eighty-five million, three hundred ninety-seven thousand, seventy-one".