685156109 has 8 divisors (see below), whose sum is σ = 764825952. Its totient is φ = 608383440.

The previous prime is 685156099. The next prime is 685156111. The reversal of 685156109 is 901651586.

685156109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685156109 - 2²⁰ = 684107533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685156139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 723794 + ... + 724739.

It is an arithmetic number, because the mean of its divisors is an integer number (95603244).

Almost surely, 2^685156109 is an apocalyptic number.

It is an amenable number.

685156109 is a deficient number, since it is larger than the sum of its proper divisors (79669843).

685156109 is a wasteful number, since it uses less digits than its factorization.

685156109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448587.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 685156109 is about 26175.4867958554. The cubic root of 685156109 is about 881.5829416213.

The spelling of 685156109 in words is "six hundred eighty-five million, one hundred fifty-six thousand, one hundred nine".