8649409 has 2 divisors, whose sum is σ = 8649410. Its totient is φ = 8649408.

The previous prime is 8649391. The next prime is 8649419. The reversal of 8649409 is 9049468.

8649409 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., 6517809 + 2131600 = 2553^2 + 1460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8649409 is a prime.

It is not a weakly prime, because it can be changed into another prime (8649419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4324704 + 4324705.

It is an arithmetic number, because the mean of its divisors is an integer number (4324705).

Almost surely, 2^8649409 is an apocalyptic number.

It is an amenable number.

8649409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8649409 is an equidigital number, since it uses as much as digits as its factorization.

8649409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 8649409 is about 2940.9877592401. The cubic root of 8649409 is about 205.2715734476.

The spelling of 8649409 in words is "eight million, six hundred forty-nine thousand, four hundred nine".