681505186 has 12 divisors (see below), whose sum is σ = 1078893702. Its totient is φ = 322817904.

The previous prime is 681505177. The next prime is 681505189.

681505186 is nontrivially palindromic in base 10.

681505186 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 398760961 + 282744225 = 19969^2 + 16815^2 .

It is not an unprimeable number, because it can be changed into a prime (681505189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 471235 + ... + 472678.

Almost surely, 2^681505186 is an apocalyptic number.

681505186 is a deficient number, since it is larger than the sum of its proper divisors (397388516).

681505186 is a wasteful number, since it uses less digits than its factorization.

681505186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943953 (or 943934 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 681505186 is about 26105.6542917430. The cubic root of 681505186 is about 880.0142843756.

The spelling of 681505186 in words is "six hundred eighty-one million, five hundred five thousand, one hundred eighty-six".