681545697 has 16 divisors (see below), whose sum is σ = 1041532800. Its totient is φ = 388334592.

The previous prime is 681545693. The next prime is 681545699. The reversal of 681545697 is 796545186.

It is not a de Polignac number, because 681545697 - 2² = 681545693 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681545693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39168 + ... + 53825.

It is an arithmetic number, because the mean of its divisors is an integer number (65095800).

Almost surely, 2^681545697 is an apocalyptic number.

It is an amenable number.

681545697 is a deficient number, since it is larger than the sum of its proper divisors (359987103).

681545697 is a wasteful number, since it uses less digits than its factorization.

681545697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93352.

The product of its digits is 1814400, while the sum is 51.

The square root of 681545697 is about 26106.4301849180. The cubic root of 681545697 is about 880.0317210501.

The spelling of 681545697 in words is "six hundred eighty-one million, five hundred forty-five thousand, six hundred ninety-seven".