685831243 has 4 divisors (see below), whose sum is σ = 691066728. Its totient is φ = 680595760.

The previous prime is 685831219. The next prime is 685831247. The reversal of 685831243 is 342138586.

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 685831243 - 2¹³ = 685823051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685831196 and 685831205.

It is not an unprimeable number, because it can be changed into a prime (685831247) 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, 2617546 + ... + 2617807.

It is an arithmetic number, because the mean of its divisors is an integer number (172766682).

Almost surely, 2^685831243 is an apocalyptic number.

685831243 is a deficient number, since it is larger than the sum of its proper divisors (5235485).

685831243 is a wasteful number, since it uses less digits than its factorization.

685831243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5235484.

The product of its digits is 138240, while the sum is 40.

The square root of 685831243 is about 26188.3799231644. The cubic root of 685831243 is about 881.8724090985.

The spelling of 685831243 in words is "six hundred eighty-five million, eight hundred thirty-one thousand, two hundred forty-three".