681548549 has 8 divisors (see below), whose sum is σ = 743800320. Its totient is φ = 619345600.

The previous prime is 681548519. The next prime is 681548557. The reversal of 681548549 is 945845186.

681548549 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 681548549 - 2⁸ = 681548293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681548497 and 681548506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681548519) 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, 20909 + ... + 42429.

It is an arithmetic number, because the mean of its divisors is an integer number (92975040).

Almost surely, 2^681548549 is an apocalyptic number.

It is an amenable number.

681548549 is a deficient number, since it is larger than the sum of its proper divisors (62251771).

681548549 is a wasteful number, since it uses less digits than its factorization.

681548549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24411.

The product of its digits is 1382400, while the sum is 50.

The square root of 681548549 is about 26106.4848074190. The cubic root of 681548549 is about 880.0329485769.

The spelling of 681548549 in words is "six hundred eighty-one million, five hundred forty-eight thousand, five hundred forty-nine".