681949186 has 16 divisors (see below), whose sum is σ = 1086019704. Its totient is φ = 320050944.

The previous prime is 681949171. The next prime is 681949193.

681949186 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 671587225 + 10361961 = 25915^2 + 3219^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14205 + ... + 39568.

Almost surely, 2^681949186 is an apocalyptic number.

681949186 is a deficient number, since it is larger than the sum of its proper divisors (404070518).

681949186 is a wasteful number, since it uses less digits than its factorization.

681949186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54165.

The product of its digits is 746496, while the sum is 52.

The square root of 681949186 is about 26114.1568119670. The cubic root of 681949186 is about 880.2053523862.

The spelling of 681949186 in words is "six hundred eighty-one million, nine hundred forty-nine thousand, one hundred eighty-six".