685737361 has 4 divisors (see below), whose sum is σ = 685810800. Its totient is φ = 685663924.

The previous prime is 685737359. The next prime is 685737397. The reversal of 685737361 is 163737586.

685737361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 685737361 - 2¹ = 685737359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685737061) 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, 20251 + ... + 42208.

It is an arithmetic number, because the mean of its divisors is an integer number (171452700).

Almost surely, 2^685737361 is an apocalyptic number.

It is an amenable number.

685737361 is a deficient number, since it is larger than the sum of its proper divisors (73439).

685737361 is a wasteful number, since it uses less digits than its factorization.

685737361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73438.

The product of its digits is 635040, while the sum is 46.

The square root of 685737361 is about 26186.5874256269. The cubic root of 685737361 is about 881.8321680410.

The spelling of 685737361 in words is "six hundred eighty-five million, seven hundred thirty-seven thousand, three hundred sixty-one".