8691646441 has 3 divisors (see below), whose sum is σ = 8691739671. Its totient is φ = 8691553212.

The previous prime is 8691646417. The next prime is 8691646477. The reversal of 8691646441 is 1446461968.

The square root of 8691646441 is 93229.

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

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 can be written as a sum of positive squares in only one way, i.e., 7952894041 + 738752400 = 89179^2 + 27180^2 .

It is not a de Polignac number, because 8691646441 - 2¹¹ = 8691644393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8691646241) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 46615 + ... + 139843.

It is an arithmetic number, because the mean of its divisors is an integer number (2897246557).

Almost surely, 2^8691646441 is an apocalyptic number.

8691646441 is the 93229-th square number.

8691646441 is the 46615-th centered octagonal number.

It is an amenable number.

8691646441 is a deficient number, since it is larger than the sum of its proper divisors (93230).

8691646441 is an frugal number, since it uses more digits than its factorization.

8691646441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186458 (or 93229 counting only the distinct ones).

The product of its digits is 995328, while the sum is 49.

The cubic root of 8691646441 is about 2056.0516353196.

Multiplying 8691646441 by its sum of digits (49), we get a square (425890675609 = 652603²).

The spelling of 8691646441 in words is "eight billion, six hundred ninety-one million, six hundred forty-six thousand, four hundred forty-one".