681688117 has 8 divisors (see below), whose sum is σ = 787404672. Its totient is φ = 583262400.

The previous prime is 681688097. The next prime is 681688127. The reversal of 681688117 is 711886186.

681688117 is nontrivially palindromic in base 5.

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 681688117 - 2¹¹ = 681686069 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 (681688127) 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, 1822509 + ... + 1822882.

It is an arithmetic number, because the mean of its divisors is an integer number (98425584).

Almost surely, 2^681688117 is an apocalyptic number.

It is an amenable number.

681688117 is a deficient number, since it is larger than the sum of its proper divisors (105716555).

681688117 is a wasteful number, since it uses less digits than its factorization.

681688117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3645419.

The product of its digits is 129024, while the sum is 46.

The square root of 681688117 is about 26109.1577229140. The cubic root of 681688117 is about 880.0930157361.

The spelling of 681688117 in words is "six hundred eighty-one million, six hundred eighty-eight thousand, one hundred seventeen".