8705009 has 2 divisors, whose sum is σ = 8705010. Its totient is φ = 8705008.

The previous prime is 8704981. The next prime is 8705029. The reversal of 8705009 is 9005078.

It is a happy number.

8705009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5536609 + 3168400 = 2353^2 + 1780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8705009 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (8705029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4352504 + 4352505.

It is an arithmetic number, because the mean of its divisors is an integer number (4352505).

Almost surely, 2^8705009 is an apocalyptic number.

It is an amenable number.

8705009 is a deficient number, since it is larger than the sum of its proper divisors (1).

8705009 is an equidigital number, since it uses as much as digits as its factorization.

8705009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 8705009 is about 2950.4252235907. The cubic root of 8705009 is about 205.7104755458.

The spelling of 8705009 in words is "eight million, seven hundred five thousand, nine".