681720411 has 16 divisors (see below), whose sum is σ = 939849728. Its totient is φ = 439084800.

The previous prime is 681720401. The next prime is 681720419. The reversal of 681720411 is 114027186.

It is not a de Polignac number, because 681720411 - 2¹⁰ = 681719387 is a prime.

It is a super-3 number, since 3×681720411³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681720419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52875 + ... + 64491.

It is an arithmetic number, because the mean of its divisors is an integer number (58740608).

Almost surely, 2^681720411 is an apocalyptic number.

681720411 is a deficient number, since it is larger than the sum of its proper divisors (258129317).

681720411 is a wasteful number, since it uses less digits than its factorization.

681720411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12282.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 681720411 is about 26109.7761576004. The cubic root of 681720411 is about 880.1069132328.

Adding to 681720411 its reverse (114027186), we get a palindrome (795747597).

The spelling of 681720411 in words is "six hundred eighty-one million, seven hundred twenty thousand, four hundred eleven".