681181188 has 12 divisors (see below), whose sum is σ = 1589422800. Its totient is φ = 227060392.

The previous prime is 681181183. The next prime is 681181219. The reversal of 681181188 is 881181186.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (681181181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28382538 + ... + 28382561.

It is an arithmetic number, because the mean of its divisors is an integer number (132451900).

Almost surely, 2^681181188 is an apocalyptic number.

It is an amenable number.

681181188 is an abundant number, since it is smaller than the sum of its proper divisors (908241612).

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

681181188 is a wasteful number, since it uses less digits than its factorization.

681181188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56765106 (or 56765104 counting only the distinct ones).

The product of its digits is 24576, while the sum is 42.

The square root of 681181188 is about 26099.4480401406. The cubic root of 681181188 is about 879.8748048481.

The spelling of 681181188 in words is "six hundred eighty-one million, one hundred eighty-one thousand, one hundred eighty-eight".