681185912 has 16 divisors (see below), whose sum is σ = 1393335000. Its totient is φ = 309629920.

The previous prime is 681185881. The next prime is 681185927. The reversal of 681185912 is 219581186.

It is a self number, because there is not a number n which added to its sum of digits gives 681185912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3870287 + ... + 3870462.

Almost surely, 2^681185912 is an apocalyptic number.

It is an amenable number.

681185912 is an abundant number, since it is smaller than the sum of its proper divisors (712149088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681185912 is a wasteful number, since it uses less digits than its factorization.

681185912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7740766 (or 7740762 counting only the distinct ones).

The product of its digits is 34560, while the sum is 41.

The square root of 681185912 is about 26099.5385399819. The cubic root of 681185912 is about 879.8768388243.

The spelling of 681185912 in words is "six hundred eighty-one million, one hundred eighty-five thousand, nine hundred twelve".