681939089 has 16 divisors (see below), whose sum is σ = 799713600. Its totient is φ = 575781696.

The previous prime is 681939043. The next prime is 681939113. The reversal of 681939089 is 980939186.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681939089 is a prime.

It is a super-2 number, since 2×681939089² = 930081842212299842, which contains 22 as substring.

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 681939089.

It is not an unprimeable number, because it can be changed into a prime (681939289) 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 15 ways as a sum of consecutive naturals, for example, 40439 + ... + 54764.

It is an arithmetic number, because the mean of its divisors is an integer number (49982100).

Almost surely, 2^681939089 is an apocalyptic number.

It is an amenable number.

681939089 is a deficient number, since it is larger than the sum of its proper divisors (117774511).

681939089 is a wasteful number, since it uses less digits than its factorization.

681939089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95264.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 681939089 is about 26113.9634869929. The cubic root of 681939089 is about 880.2010082320.

The spelling of 681939089 in words is "six hundred eighty-one million, nine hundred thirty-nine thousand, eighty-nine".