685823529 has 4 divisors (see below), whose sum is σ = 914431376. Its totient is φ = 457215684.

The previous prime is 685823521. The next prime is 685823561. The reversal of 685823529 is 925328586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 685823529 - 2³ = 685823521 is a prime.

It is a super-3 number, since 3×685823529³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685823521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114303919 + ... + 114303924.

It is an arithmetic number, because the mean of its divisors is an integer number (228607844).

Almost surely, 2^685823529 is an apocalyptic number.

It is an amenable number.

685823529 is a deficient number, since it is larger than the sum of its proper divisors (228607847).

685823529 is a wasteful number, since it uses less digits than its factorization.

685823529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228607846.

The product of its digits is 1036800, while the sum is 48.

The square root of 685823529 is about 26188.2326436894. The cubic root of 685823529 is about 881.8691027510.

The spelling of 685823529 in words is "six hundred eighty-five million, eight hundred twenty-three thousand, five hundred twenty-nine".