8641375681 has 3 divisors (see below), whose sum is σ = 8641468641. Its totient is φ = 8641282722.

The previous prime is 8641375669. The next prime is 8641375703. The reversal of 8641375681 is 1865731468.

It is a happy number.

The square root of 8641375681 is 92959.

It is a perfect power (a square), and thus also a powerful number.

8641375681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 8641375681 - 2¹³ = 8641367489 is a prime.

It is a super-2 number, since 2×8641375681² (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 (8641375381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 46480 + ... + 139438.

It is an arithmetic number, because the mean of its divisors is an integer number (2880489547).

Almost surely, 2^8641375681 is an apocalyptic number.

8641375681 is the 92959-th square number.

8641375681 is the 46480-th centered octagonal number.

It is an amenable number.

8641375681 is a deficient number, since it is larger than the sum of its proper divisors (92960).

8641375681 is an frugal number, since it uses more digits than its factorization.

8641375681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185918 (or 92959 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

The cubic root of 8641375681 is about 2052.0800367797.

Multiplying 8641375681 by its sum of digits (49), we get a square (423427408369 = 650713²).

The spelling of 8641375681 in words is "eight billion, six hundred forty-one million, three hundred seventy-five thousand, six hundred eighty-one".