681730197 has 8 divisors (see below), whose sum is σ = 912353760. Its totient is φ = 452796720.

The previous prime is 681730183. The next prime is 681730219. The reversal of 681730197 is 791037186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 681730197 - 2¹⁰ = 681729173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681730177) by changing a digit.

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, 421579 + ... + 423192.

It is an arithmetic number, because the mean of its divisors is an integer number (114044220).

Almost surely, 2^681730197 is an apocalyptic number.

It is an amenable number.

681730197 is a deficient number, since it is larger than the sum of its proper divisors (230623563).

681730197 is a wasteful number, since it uses less digits than its factorization.

681730197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845043.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 681730197 is about 26109.9635579983. The cubic root of 681730197 is about 880.1111244827. Note that the first 4 decimals are identical.

The spelling of 681730197 in words is "six hundred eighty-one million, seven hundred thirty thousand, one hundred ninety-seven".