8491204069 has 4 divisors (see below), whose sum is σ = 8491391244. Its totient is φ = 8491016896.

The previous prime is 8491204039. The next prime is 8491204093. The reversal of 8491204069 is 9604021948.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 474150625 + 8017053444 = 21775^2 + 89538^2 .

It is a cyclic number.

It is not a de Polignac number, because 8491204069 - 2¹¹ = 8491202021 is a prime.

It is a super-2 number, since 2×8491204069² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8491204039) 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, 22269 + ... + 132205.

It is an arithmetic number, because the mean of its divisors is an integer number (2122847811).

Almost surely, 2^8491204069 is an apocalyptic number.

It is an amenable number.

8491204069 is a deficient number, since it is larger than the sum of its proper divisors (187175).

8491204069 is a wasteful number, since it uses less digits than its factorization.

8491204069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187174.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 8491204069 is about 92147.7295922151. The cubic root of 8491204069 is about 2040.1233480620.

The spelling of 8491204069 in words is "eight billion, four hundred ninety-one million, two hundred four thousand, sixty-nine".