681930449 has 8 divisors (see below), whose sum is σ = 700028160. Its totient is φ = 664069536.

The previous prime is 681930443. The next prime is 681930451. The reversal of 681930449 is 944039186.

681930449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 681930449 - 2⁴ = 681930433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681930443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53357 + ... + 64890.

It is an arithmetic number, because the mean of its divisors is an integer number (87503520).

Almost surely, 2^681930449 is an apocalyptic number.

It is an amenable number.

681930449 is a deficient number, since it is larger than the sum of its proper divisors (18097711).

681930449 is a wasteful number, since it uses less digits than its factorization.

681930449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118399.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 681930449 is about 26113.7980577319. The cubic root of 681930449 is about 880.1972909064.

The spelling of 681930449 in words is "six hundred eighty-one million, nine hundred thirty thousand, four hundred forty-nine".