685744159 has 2 divisors, whose sum is σ = 685744160. Its totient is φ = 685744158.

The previous prime is 685744153. The next prime is 685744183. The reversal of 685744159 is 951447586.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685744159 - 2³ = 685744151 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685744151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342872079 + 342872080.

It is an arithmetic number, because the mean of its divisors is an integer number (342872080).

Almost surely, 2^685744159 is an apocalyptic number.

685744159 is a deficient number, since it is larger than the sum of its proper divisors (1).

685744159 is an equidigital number, since it uses as much as digits as its factorization.

685744159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 49.

The square root of 685744159 is about 26186.7172245778. The cubic root of 685744159 is about 881.8350820212.

The spelling of 685744159 in words is "six hundred eighty-five million, seven hundred forty-four thousand, one hundred fifty-nine".