8712509 has 4 divisors (see below), whose sum is σ = 9382716. Its totient is φ = 8042304.

The previous prime is 8712497. The next prime is 8712523. The reversal of 8712509 is 9052178.

8712509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9052178 = 2 ⋅4526089.

It can be written as a sum of positive squares in 2 ways, for example, as 5508409 + 3204100 = 2347^2 + 1790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8712509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8712709) 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, 335084 + ... + 335109.

It is an arithmetic number, because the mean of its divisors is an integer number (2345679).

Almost surely, 2^8712509 is an apocalyptic number.

It is an amenable number.

8712509 is a deficient number, since it is larger than the sum of its proper divisors (670207).

8712509 is a wasteful number, since it uses less digits than its factorization.

8712509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670206.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 8712509 is about 2951.6959531767. The cubic root of 8712509 is about 205.7695367787.

The spelling of 8712509 in words is "eight million, seven hundred twelve thousand, five hundred nine".