8491069609 has 9 divisors (see below), whose sum is σ = 9334273431. Its totient is φ = 7718232720.

The previous prime is 8491069567. The next prime is 8491069621. The reversal of 8491069609 is 9069601948.

The square root of 8491069609 is 92147.

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

It can be written as a sum of positive squares in only one way, i.e., 1219755625 + 7271313984 = 34925^2 + 85272^2 .

It is not a de Polignac number, because 8491069609 - 2¹⁹ = 8490545321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8491069669) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1009429 + ... + 1017805.

Almost surely, 2^8491069609 is an apocalyptic number.

8491069609 is the 92147-th square number.

8491069609 is the 46074-th centered octagonal number.

It is an amenable number.

8491069609 is a deficient number, since it is larger than the sum of its proper divisors (843203822).

8491069609 is an frugal number, since it uses more digits than its factorization.

8491069609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16776 (or 8388 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 52.

The cubic root of 8491069609 is about 2040.1125794112.

The spelling of 8491069609 in words is "eight billion, four hundred ninety-one million, sixty-nine thousand, six hundred nine".