681085989 has 24 divisors (see below), whose sum is σ = 1073931040. Its totient is φ = 430156656.

The previous prime is 681085981. The next prime is 681086041. The reversal of 681085989 is 989580186.

It is not a de Polignac number, because 681085989 - 2³ = 681085981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681085981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69142 + ... + 78375.

Almost surely, 2^681085989 is an apocalyptic number.

It is an amenable number.

681085989 is a deficient number, since it is larger than the sum of its proper divisors (392845051).

681085989 is a wasteful number, since it uses less digits than its factorization.

681085989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147551 (or 147539 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The square root of 681085989 is about 26097.6242022143. The cubic root of 681085989 is about 879.8338137454.

The spelling of 681085989 in words is "six hundred eighty-one million, eighty-five thousand, nine hundred eighty-nine".