685431759 has 4 divisors (see below), whose sum is σ = 913909016. Its totient is φ = 456954504.

The previous prime is 685431743. The next prime is 685431767. The reversal of 685431759 is 957134586.

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

It is not a de Polignac number, because 685431759 - 2⁴ = 685431743 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 (685431259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114238624 + ... + 114238629.

It is an arithmetic number, because the mean of its divisors is an integer number (228477254).

Almost surely, 2^685431759 is an apocalyptic number.

685431759 is a deficient number, since it is larger than the sum of its proper divisors (228477257).

685431759 is a wasteful number, since it uses less digits than its factorization.

685431759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228477256.

The product of its digits is 907200, while the sum is 48.

The square root of 685431759 is about 26180.7516889794. The cubic root of 685431759 is about 881.7011510596.

The spelling of 685431759 in words is "six hundred eighty-five million, four hundred thirty-one thousand, seven hundred fifty-nine".