681487085 has 8 divisors (see below), whose sum is σ = 817927800. Its totient is φ = 545094144.

The previous prime is 681487073. The next prime is 681487099. The reversal of 681487085 is 580784186.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 321018889 + 360468196 = 17917^2 + 18986^2 .

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 681487085 - 2¹⁰ = 681486061 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 39941 + ... + 54389.

It is an arithmetic number, because the mean of its divisors is an integer number (102240975).

Almost surely, 2^681487085 is an apocalyptic number.

It is an amenable number.

681487085 is a deficient number, since it is larger than the sum of its proper divisors (136440715).

681487085 is a wasteful number, since it uses less digits than its factorization.

681487085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23887.

The product of its (nonzero) digits is 430080, while the sum is 47.

The square root of 681487085 is about 26105.3076020950. The cubic root of 681487085 is about 880.0064931511.

The spelling of 681487085 in words is "six hundred eighty-one million, four hundred eighty-seven thousand, eighty-five".