8689509 has 12 divisors (see below), whose sum is σ = 12789036. Its totient is φ = 5683392.

The previous prime is 8689493. The next prime is 8689529. The reversal of 8689509 is 9059868.

It can be written as a sum of positive squares in 2 ways, for example, as 4088484 + 4601025 = 2022^2 + 2145^2 .

It is not a de Polignac number, because 8689509 - 2⁴ = 8689493 is a prime.

It is a super-2 number, since 2×8689509² = 151015133322162, which contains 22 as substring.

8689509 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8689529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8632 + ... + 9585.

It is an arithmetic number, because the mean of its divisors is an integer number (1065753).

Almost surely, 2^8689509 is an apocalyptic number.

It is an amenable number.

8689509 is a deficient number, since it is larger than the sum of its proper divisors (4099527).

8689509 is a wasteful number, since it uses less digits than its factorization.

8689509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18276 (or 18273 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 8689509 is about 2947.7973132493. The cubic root of 8689509 is about 205.5883080781.

The spelling of 8689509 in words is "eight million, six hundred eighty-nine thousand, five hundred nine".