8581712681 has 4 divisors (see below), whose sum is σ = 8660444100. Its totient is φ = 8502981264.

The previous prime is 8581712669. The next prime is 8581712687. The reversal of 8581712681 is 1862171858.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1862171858 = 2 ⋅931085929.

It can be written as a sum of positive squares in 2 ways, for example, as 3221130025 + 5360582656 = 56755^2 + 73216^2 .

It is a cyclic number.

It is not a de Polignac number, because 8581712681 - 2¹⁴ = 8581696297 is a prime.

It is a super-2 number, since 2×8581712681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8581712687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39365546 + ... + 39365763.

It is an arithmetic number, because the mean of its divisors is an integer number (2165111025).

Almost surely, 2^8581712681 is an apocalyptic number.

It is an amenable number.

8581712681 is a deficient number, since it is larger than the sum of its proper divisors (78731419).

8581712681 is a wasteful number, since it uses less digits than its factorization.

8581712681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78731418.

The product of its digits is 215040, while the sum is 47.

The square root of 8581712681 is about 92637.5338672182. The cubic root of 8581712681 is about 2047.3463726350.

The spelling of 8581712681 in words is "eight billion, five hundred eighty-one million, seven hundred twelve thousand, six hundred eighty-one".