681363946 has 4 divisors (see below), whose sum is σ = 1022045922. Its totient is φ = 340681972.

The previous prime is 681363931. The next prime is 681363967. The reversal of 681363946 is 649363186.

681363946 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.

It can be written as a sum of positive squares in only one way, i.e., 422508025 + 258855921 = 20555^2 + 16089^2 .

It is a junction number, because it is equal to n+sod(n) for n = 681363896 and 681363905.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170340985 + ... + 170340988.

Almost surely, 2^681363946 is an apocalyptic number.

681363946 is a deficient number, since it is larger than the sum of its proper divisors (340681976).

681363946 is a wasteful number, since it uses less digits than its factorization.

681363946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340681975.

The product of its digits is 559872, while the sum is 46.

The square root of 681363946 is about 26102.9489904876. The cubic root of 681363946 is about 879.9534866944.

The spelling of 681363946 in words is "six hundred eighty-one million, three hundred sixty-three thousand, nine hundred forty-six".