8509969 has 4 divisors (see below), whose sum is σ = 9164596. Its totient is φ = 7855344.

The previous prime is 8509939. The next prime is 8509973. The reversal of 8509969 is 9699058.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9699058 = 2 ⋅4849529.

It can be written as a sum of positive squares in 2 ways, for example, as 5313025 + 3196944 = 2305^2 + 1788^2 .

It is a cyclic number.

It is not a de Polignac number, because 8509969 - 2⁵ = 8509937 is a prime.

It is a super-2 number, since 2×8509969² = 144839144761922, which contains 22 as substring.

It is a Duffinian number.

8509969 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8509909) 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, 327294 + ... + 327319.

It is an arithmetic number, because the mean of its divisors is an integer number (2291149).

Almost surely, 2^8509969 is an apocalyptic number.

It is an amenable number.

8509969 is a deficient number, since it is larger than the sum of its proper divisors (654627).

8509969 is a wasteful number, since it uses less digits than its factorization.

8509969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654626.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 8509969 is about 2917.1851158266. The cubic root of 8509969 is about 204.1625082776.

The spelling of 8509969 in words is "eight million, five hundred nine thousand, nine hundred sixty-nine".