65217109 has 2 divisors, whose sum is σ = 65217110. Its totient is φ = 65217108.

The previous prime is 65217071. The next prime is 65217127. The reversal of 65217109 is 90171256.

65217109 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., 64883025 + 334084 = 8055^2 + 578^2 .

It is a cyclic number.

It is not a de Polignac number, because 65217109 - 2⁹ = 65216597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65217179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32608554 + 32608555.

It is an arithmetic number, because the mean of its divisors is an integer number (32608555).

Almost surely, 2^65217109 is an apocalyptic number.

It is an amenable number.

65217109 is a deficient number, since it is larger than the sum of its proper divisors (1).

65217109 is an equidigital number, since it uses as much as digits as its factorization.

65217109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 65217109 is about 8075.7110522851. The cubic root of 65217109 is about 402.5197377253.

The spelling of 65217109 in words is "sixty-five million, two hundred seventeen thousand, one hundred nine".