681563273 has 8 divisors (see below), whose sum is σ = 701160192. Its totient is φ = 662028336.

The previous prime is 681563261. The next prime is 681563297. The reversal of 681563273 is 372365186.

681563273 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 681563273 - 2¹⁶ = 681497737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681563273.

It is not an unprimeable number, because it can be changed into a prime (681563203) 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, 7286 + ... + 37632.

It is an arithmetic number, because the mean of its divisors is an integer number (87645024).

Almost surely, 2^681563273 is an apocalyptic number.

It is an amenable number.

681563273 is a deficient number, since it is larger than the sum of its proper divisors (19596919).

681563273 is a wasteful number, since it uses less digits than its factorization.

681563273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30991.

The product of its digits is 181440, while the sum is 41.

The square root of 681563273 is about 26106.7668047960. The cubic root of 681563273 is about 880.0392858667.

The spelling of 681563273 in words is "six hundred eighty-one million, five hundred sixty-three thousand, two hundred seventy-three".