686444041 has 4 divisors (see below), whose sum is σ = 697697284. Its totient is φ = 675190800.

The previous prime is 686444029. The next prime is 686444047. The reversal of 686444041 is 140444686.

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

It can be written as a sum of positive squares in 2 ways, for example, as 272118016 + 414326025 = 16496^2 + 20355^2 .

It is a cyclic number.

It is not a de Polignac number, because 686444041 - 2⁵ = 686444009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686444047) 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, 5626530 + ... + 5626651.

It is an arithmetic number, because the mean of its divisors is an integer number (174424321).

Almost surely, 2^686444041 is an apocalyptic number.

686444041 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

686444041 is a deficient number, since it is larger than the sum of its proper divisors (11253243).

686444041 is a wasteful number, since it uses less digits than its factorization.

686444041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11253242.

The product of its (nonzero) digits is 73728, while the sum is 37.

The square root of 686444041 is about 26200.0771182071. The cubic root of 686444041 is about 882.1349852448.

It can be divided in two parts, 6864 and 44041, that added together give a palindrome (50905).

The spelling of 686444041 in words is "six hundred eighty-six million, four hundred forty-four thousand, forty-one".