681509912 has 16 divisors (see below), whose sum is σ = 1280574360. Its totient is φ = 340023424.

The previous prime is 681509909. The next prime is 681509951. The reversal of 681509912 is 219905186.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 681509912.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 87473 + ... + 94944.

Almost surely, 2^681509912 is an apocalyptic number.

It is an amenable number.

681509912 is a deficient number, since it is larger than the sum of its proper divisors (599064448).

681509912 is a wasteful number, since it uses less digits than its factorization.

681509912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182890 (or 182886 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 681509912 is about 26105.7448083750. The cubic root of 681509912 is about 880.0163185679.

The spelling of 681509912 in words is "six hundred eighty-one million, five hundred nine thousand, nine hundred twelve".