8501609 has 2 divisors, whose sum is σ = 8501610. Its totient is φ = 8501608.

The previous prime is 8501579. The next prime is 8501617. The reversal of 8501609 is 9061058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7507600 + 994009 = 2740^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 8501609 - 2¹⁶ = 8436073 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8501639) 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 as a sum of consecutive naturals, namely, 4250804 + 4250805.

It is an arithmetic number, because the mean of its divisors is an integer number (4250805).

Almost surely, 2^8501609 is an apocalyptic number.

It is an amenable number.

8501609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8501609 is an equidigital number, since it uses as much as digits as its factorization.

8501609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 8501609 is about 2915.7518755889. The cubic root of 8501609 is about 204.0956315051.

The spelling of 8501609 in words is "eight million, five hundred one thousand, six hundred nine".